HouseholdRanker
Menu

Review

SMARTRO SC31B Projection Alarm Clock Review

The SMARTRO SC31B is a compact digital projection alarm clock for bedroom use, combining dual alarms, a color-adjustable LCD, indoor/outdoor temperature readings and USB charging. Its projected information and readable display are popular with buyers, but the remote sensor has mixed feedback for accuracy and reliability.
Expert reviewed
78
Overall score
Data-driven scoring Expert reviewed Updated analysis

Why we ranked it highly

The SMARTRO SC31B is a tabletop digital alarm clock designed primarily for bedroom routines. Its core function is straightforward timekeeping and waking, but it adds red wall or ceiling projection, two independently set alarms, a five-minute snooze setting, calendar information and a 3-inch backlit LCD. The display can be adjusted across four brightness settings, and users can select or cycle through backlight colors. An included wireless remote sensor supplies an outdoor temperature reading alongside the indoor measurement. The clock also presents weather and barometric-pressure trend information as listed by the manufacturer. AC power supports the normal display and projection functions, while two AAA batteries, sold separately, preserve settings during power loss. At 5.28 inches wide and 150 grams, it is a small bedside device with a USB charging output, though it is not a smart-home product.
90-day review Expert reviewed User feedback Data scoring

Key specs

Features & Specs

Display Type
LCD
Additional Features
Adjustable Brightness, Alarm, Calendar Display, Charging Port, Projection Clock
Power Source
Corded Electric
Indoor Outdoor Usage
Indoor
Batteries are Included
No
Mounting Type
Tabletop
Number of Batteries
2 AAA batteries required.
Alarm Clock
Yes
Operation Mode
Electrical
Smart Home Compatibility
Not Smart Home Compatible
Connectivity Technology
Power Adapter
Watch Movement
Automatic

Measurements

Item Dimensions W x H
5.28"W x 3.15"H
Item Weight
150 Grams
Screen Size
3 Inches
Size
Small

Materials & Care

Material Type
Plastic
Frame Material
Plastic

Style

Color
Black
Style Name
Digital
Room Type
Bedroom
Shape
Rectangular
Theme
Plain
Dial Color
Black
Clock Form
Travel

Item details

Brand Name
SMARTRO
Number of Items
1
Manufacturer
SMARTRO
UPC
604213902313 604213902337 604213904249 604213904348 604213904218 604213901712 604213904270 604213904195 604213904294 604213904201 604213904256 604213904355 604213904225 604213904324 604213904263 604213904362 604213904287 604213904232 604213904331
Manufacturer Part Number
SC31B
Model Number
SC31B
Included Components
adapter cord, manual, remote sensor
Unit Count
14.24 Ounce

Scores breakdown

80 /100

Performance

88 /100

Features

75 /100

Safety

84 /100

Comfort

84 /100

Ease of use

90 /100

Space efficiency

70 /100

Noise

82 /100

Design

Strengths

  • Clear red time and temperature projection for wall or ceiling viewing.
  • Dual alarms, five-minute snooze and an automatic two-minute alarm cutoff.
  • Large 3-inch LCD with adjustable brightness and selectable backlight colors.
  • Indoor and remote-sensor temperature readings add useful bedside context.
  • USB output provides convenient bedside charging.
  • Compact tabletop format takes up little nightstand space.

Limitations

  • Outdoor temperature accuracy receives mixed buyer feedback.
  • Some reviews report remote-sensor failures or a dimming display over time.
  • The light plastic body can be easy to knock over, particularly around the power cord.
  • The remote sensor may be difficult to position accurately where it is exposed to direct sunlight or weather.
  • It is not smart-home compatible and has no app-based controls.
  • Battery backup preserves settings during an outage, but batteries are not included.

Ideal user profiles

  • Bedroom users who want to check the time without turning on a room light.
  • Couples or households needing two separate wake-up times.
  • Buyers who value indoor and nearby outdoor temperature information at the bedside.
  • People with limited nightstand space who want a compact corded clock.

Use cases

  • Projecting the time onto a bedroom wall or ceiling at night.
  • Setting separate weekday wake-up alarms for two people or routines.
  • Checking indoor and remote-sensor temperature before getting dressed.
  • Charging a phone from a bedside USB output.
  • Using a dimmed or switched-off display in a light-sensitive bedroom.
  • Keeping time and alarm settings stored through a power interruption with backup batteries installed.

Fit and positioning

Who this works for

Category positioning

This is a bedroom comfort and lifestyle gadget rather than a smart display or full home-weather system. Its main household role is making the time, alarms and basic temperature information easy to access from bed. Projection is the differentiating feature: it can reduce the need to turn toward the clock or switch on a light during the night. The remote sensor broadens its usefulness, but mixed feedback means it is best considered a convenient reference rather than the sole source for critical outdoor temperature decisions.

Best for

The SC31B is best for people who specifically want a projection alarm clock with a compact bedside footprint. It suits users who value a clear nighttime view of the time, dual wake-up schedules, adjustable screen brightness and a nearby USB charging point. Buyers also appreciate the ability to see indoor and remote-sensor temperatures together. It is particularly practical in bedrooms where a fully lit clock display would be distracting.

Not best for

This clock is less suitable for buyers who need highly dependable outdoor temperature monitoring, as accuracy and sensor reliability receive mixed reviews. It may also frustrate users wanting app access, voice control or smart-home routines, since none are supported. The lightweight plastic housing is not ideal for an unstable or crowded bedside table, and the sensor needs a thoughtfully sheltered location to avoid misleading readings in direct sunlight or exposed conditions.

Home use

In everyday use, the SC31B acts as a small bedside information hub: it shows the time, date, weekday and temperature while providing two alarms and a charging outlet. Its adjustable display lighting gives users more control over how much light the clock adds to a bedroom. Battery backup is useful for retaining saved settings after a power interruption, provided the required AAA batteries are fitted.

Performance analysis

How it performs in practice

Each scoring dimension is separated into a compact card so the strengths and tradeoffs are easier to compare without reading one long block.

Performance analysis

For its primary role as a projection alarm clock, the SC31B performs strongly on the information provided. Reviews repeatedly praise the clear large digits, readable projection and straightforward alarm operation, and several buyers find it useful for checking the time without fully waking. The clock also projects temperature information, which is an uncommon addition in this format. The weaker point is the remote outdoor-temperature feature: feedback ranges from useful to inaccurate, and some users report sensor failure, limiting confidence in this secondary function.

Feature analysis

The feature set is unusually broad for a small bedside clock. It includes dual alarms, snooze, adjustable LCD brightness, selectable and cycling backlight colors, projection orientation control, calendar information, indoor/outdoor readings and USB charging. AC power enables continuous display and projection, while optional battery backup retains settings. However, these are standalone controls rather than connected features; there is no stated app, voice assistant, smart-home compatibility or remote scheduling.

Safety

No specific safety certification or protective system is provided in the listing, so safety assessment should remain practical. Use the included AC adapter as intended, keep the clock and remote sensor dry, and route the cord where it cannot be pulled or create a trip hazard. The small, lightweight body should be positioned securely to reduce the chance of falls. Battery backup requires two AAA batteries, which should be installed with correct polarity and kept away from children.

Comfort

The SC31B is designed around a more comfortable night-time routine. Its key advantage is the ability to read the projected time without turning on a bedside lamp or focusing on the clock face. The display can be dimmed or turned off, which may help light-sensitive sleepers, while the dual alarms suit households with separate schedules. The main comfort caveat is that inaccurate remote temperature data can reduce the usefulness of the weather-oriented display.

How it compares

Within the projection alarm-clock category, the SC31B appears stronger than a basic model for convenience features and bedside readability. It combines adjustable display brightness and colors, dual alarms, USB charging, indoor/outdoor temperature display and projected information in a notably compact format. It is also more portable and space-conscious than larger bedside weather displays. Its trade-off is that the outdoor sensor should not be treated as a guaranteed high-accuracy weather instrument, given repeated mixed feedback. It is not a substitute for a smart clock if app management, voice assistants, connected routines or wider smart-home integration are priorities.

Ranking summary

The SMARTRO SC31B ranks as a strong all-round projection alarm clock because it pairs a practical core function with more bedside convenience than a basic digital model. Clear projection, a readable adjustable LCD, dual alarms, USB charging and a compact footprint are its strongest reasons to consider it. Its large review base also points to generally positive daily ownership. It does not rank as highly as a fully dependable weather-focused device, however, because remote-sensor accuracy and longevity receive mixed feedback. The light body and lack of smart-home functions further define it as a capable conventional bedside clock rather than a connected home hub.

Buying advice

Consider the SMARTRO SC31B if your priority is seeing the time comfortably from bed and you want dual alarms, a dimmable display and a convenient USB port in one small unit. It is a particularly sensible choice when projection is a feature you expect to use every night. Before buying, check that you have a suitable wall or ceiling within the suggested projection range and plan a sheltered, shaded location for the remote sensor. Supply AAA batteries for backup settings. Choose another model if dependable outdoor measurement, a heavier chassis, smart-home compatibility or app-based control is essential.
78
Overall score

Final verdict

The SMARTRO SC31B is a strong conventional projection alarm clock for bedrooms. Its main strengths are the clear projected display, useful dual alarms, adjustable lighting, compact dimensions and practical extras such as USB charging and indoor/outdoor temperature display. Customer feedback suggests it is easy to live with and effective at night. Its main limitation is the remote sensor, where accuracy and reliability are not consistently praised; the lightweight body is another modest drawback. For buyers focused on bedside time projection rather than connected smart-home features, it is a well-equipped option at its listed price.
Back to review

Key topics

SMARTRO SC31B review, SMARTRO projection alarm clock, digital projection alarm clock, bedroom alarm clock with temperature, indoor outdoor thermometer clock, dual alarm clock with USB charger, weather station alarm clock

Frequently asked questions

Is the SMARTRO SC31B a good bedroom alarm clock?
The SMARTRO SC31B is well suited to bedside use for buyers who want projected time, a readable LCD, adjustable display brightness and two alarms. Customer feedback is broadly positive about night-time visibility and setup. Its main compromise is that the remote outdoor-temperature function has mixed feedback for accuracy and long-term reliability.
Can the SMARTRO SC31B project time and temperature?
Yes. The clock projects time and cycles between indoor and outdoor temperature information in soft red light. SMARTRO suggests a projection distance of 5 to 13 feet, and the image can be flipped 180 degrees by holding the designated button. Projection can also be switched off when it is not wanted.
Does the SMARTRO SC31B have two alarms?
Yes. The SC31B supports two separately set alarms, which can suit different wake-up schedules. It includes a five-minute snooze function, while pressing a button other than the top button stops an alarm for the day. An unattended alarm is specified to stop automatically after two minutes.
How accurate is the SMARTRO SC31B outdoor temperature reading?
Buyer feedback on the remote outdoor reading is mixed. Some users find the indoor/outdoor display useful, while others report inaccurate readings or sensor failures. One review also noted that direct sunlight substantially raised the reported temperature. Careful sensor placement away from sun and exposed weather is important for the most useful results.
Is the SMARTRO SC31B easy to set up?
Many reviewers describe the clock as easy to set up and use, despite its broad set of display, alarm and projection options. The included components are an adapter cord, manual and remote sensor. Keeping the manual available may be helpful when changing display colors, projection settings or other less frequently used controls.
Does the SMARTRO SC31B work with smart-home systems?
No. The supplied specifications identify the SC31B as not smart-home compatible. It does not offer app controls, voice-assistant integration or household automation features in the provided information. Its connected element is the included remote temperature sensor rather than a smart-home platform.
Does the SMARTRO SC31B charge a phone?
Yes. It has a 5V/1.2A USB output interface intended for charging smartphones or other devices. This is a useful convenience for a bedside table, although buyers should check that this output meets their charging-speed expectations, as the provided specification does not describe fast-charging support.
What are the main drawbacks of the SMARTRO SC31B?
The most consistent concerns involve the remote sensor, including mixed accuracy feedback and reports that it stopped working. Some buyers also mention display dimming over time. Its lightweight plastic construction can be knocked over easily, and buyers seeking app control or smart-home integration will need a different type of alarm clock.

Related Guides & Rankings

Monstake Automatic Soap Dispenser Review Monstake Automatic Soap Dispenser Review WallarGe Night Light Wall Clock Review WallarGe Night Light Wall Clock Review