1 / 7DreamSky ST-28 Pendulum Digital Alarm Clock, Large Red-Digit Display
DreamSky ST-28 Pendulum is a corded digital alarm clock with a large red-digit display, adjustable brightness and alarm volume, and a USB charging port. Its plug-in power is required for the clock display and alarm, while backup batteries only retain settings during an outage.
At a glance
- Large, illuminated red digits are intended to be readable from a distance.
- Display brightness is adjustable across a stated 0-100% range.
- Alarm volume is adjustable, and the listing describes one alarm with a 9-minute snooze.
- USB port is provided for charging another device.
- Power adapter is required for normal clock operation. Backup batteries retain settings but do not keep the screen on or sound the alarm during an outage.
Reference price: $28.99
Price checked: Nov 14, 2026
View offerAhead of Black FridayExplore the selectionPros and cons
Pros
- Large digits and a dimmable display offer flexibility for bedside viewing, including in a dark room.
- Adjustable alarm volume and a snooze function give some control over the wake-up sound and timing.
- A USB charging port adds a charging connection at the clock.
Cons
- The listing says backup batteries only preserve settings during a power outage, so the display and alarm stop without adapter power.
Technical specifications
14 specifications| Brand | DreamSky |
|---|---|
| Model | ST-28 Pendulum |
| Screen size listed | 40 centimeters |
|---|---|
| Display technology listed | Digital |
| Color | Black Case + Red Digit |
| Connection listed | USB |
|---|---|
| Alarm | Yes |
| Alarm setting | Single alarm setting with 9 minutes snooze |
| Alarm volume range | 30-90 DP |
| Power configuration | Corded Electric |
|---|---|
| Backup battery requirement listed | 2 AA batteries required. |
| Mounting type | Tabletop |
|---|---|
| Form factor | Rectangular |
| Dimensions | 8.5"W x 4"H |
What to know before buying
Listing details to confirm
Listing details are inconsistent about backup battery size: the specifications say 2 AA batteries, while the feature description says 2 x AAA batteries. The listing also calls the display 40 centimeters while separately describing 3-inch digits and a 9-inch clock, so those size details are unconfirmed. Check the selected listing for the intended dimensions and battery type.
Who is it for?
A good fit for
- People who want large digital time digits with adjustable display brightness for a bedside or tabletop clock.
- Buyers who want an adjustable-volume alarm, snooze, and a USB charging port in a plug-in clock.
Less suited to
- Anyone who needs a clock that continues displaying the time or sounding an alarm on battery power during an outage.
- Buyers who need multiple alarm settings, which are not listed for this single-alarm model.
Customer reviews on Amazon
- 5 stars
84% 84% - 4 stars
10% 10% - 3 stars
2% 2% - 2 stars
1% 1% - 1 star
3% 3%
Customer feedback highlights the large, readable digits, visibility from across a room, brightness adjustment and straightforward setup. Those impressions are relevant for bedside use, where the adjustable display can help tailor nighttime visibility, though they do not establish how every user will perceive the display or alarm. Feedback also describes the clock as worth its price. The supplied rating distribution is mostly five-star, with a smaller share of lower ratings, but it does not explain individual reasons.
Positive themes
- Customer feedback praises digit readability and visibility from a distance.
- Customers are reported to appreciate the dimmable brightness and straightforward operation.
Frequently asked questions
Will the clock keep displaying the time during a power outage?
No. The listing says the adapter is needed to operate the clock. Backup batteries store settings, but the screen goes blank and the alarm will not sound on battery power alone.
What battery size does it use for backup?
The listing conflicts: its specification says 2 AA batteries, while a feature description says 2 x AAA batteries. Confirm the required type in the selected listing.
Can the display brightness and alarm volume be adjusted?
The listing describes a 0-100% display dimmer and adjustable alarm volume, with a stated alarm range of 30-90 DP.
Does it have more than one alarm?
The supplied feature description specifies a single alarm setting and a 9-minute snooze.
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Offer details
- The adapter is required for normal clock operation. Backup batteries are for retaining settings only, and the listing conflicts on whether they are AA or AAA.