Complete Setup Guide for Your LED Digital Alarm Clock
Everything you need to get your DS-6637 alarm clock running perfectly — from unboxing to advanced settings, explained simply and clearly.
01
What's Inside the Box?
Before you begin, open your package and check that all items have arrived safely:
1 × LED Digital Alarm Clock
Model DS-6637. The mirror display face should be clean and undamaged.
1 × USB Power Cable (DC 5V)
Used to connect the clock to any standard USB charger or wall adapter. No adapter is included — any standard phone charger works perfectly.
1 × Printed Instruction Card
The quick-start guide included in the box. You're reading the detailed online version right now — this covers everything in much more depth.
Something missing or damaged? Please contact our customer support immediately with your order number and a photo. We'll resolve it right away — no questions asked.
02
How to Power On the Clock
Your clock supports two power methods. Both work perfectly — it simply depends on where you plan to place it.
★ Recommended
Method 1 — USB / DC 5V Power
Plug the included USB cable into the port on the back of the clock, then connect to any standard mobile charger or USB wall adapter. The display lights up immediately.
Display stays fully bright at all times in USB mode — no sleep or dimming.
Method 2 — 3 × AAA Batteries
Open the battery compartment on the back. Insert 3 AAA batteries, carefully matching the + and − markings inside. Ideal for placement without a nearby power socket.
Note: In battery mode, the screen turns off after 10–16 seconds to save power. Hold down any key to light it up again.
The auto-off in battery mode is by design — not a defect. If you prefer an always-on display, USB power is the better choice.
03
Setting the Time and Date
The clock uses five buttons on top: S, +, −, SNOOZE, and a ⏰ clock icon button. Follow these steps in order:
1
Enter Setup Mode — Long Press S
Hold the S button for about 3 seconds until the display starts blinking. The clock is now in setup mode.
2
Choose 12H or 24H Format
Press + or − to toggle between 12H (AM/PM) and 24H. Press S to confirm.
💡 Most Indian users prefer 12H format.
💡 Most Indian users prefer 12H format.
3
Set the Hour
Hour digits blink. Press + to increase or − to decrease. Hold for faster scrolling. Press S to confirm.
4
Set the Minutes
Minute digits blink. Use + and − to adjust. Press S to confirm.
5
Set the Year
Use + or − to set the correct year. Press S to confirm.
6
Set the Month
Months shown as numbers: 1 = January … 12 = December. Press + or −, then S.
7
Set the Date
Set the correct date using + and −. Press S to confirm.
8
Switch Night Mode — Then Exit
Press + or − to choose S OF (night mode off) or S NO (night mode on — display auto-dims between 22:00 and 06:00). Press S to confirm and exit. Your clock is now live!
Made a mistake? Simply long-press S again to restart the setup from Step 1.
If no button is pressed for a few seconds during setup, the clock automatically saves and exits. Re-enter setup to make further changes.
📺 Watch: How to Set the Time & Date
04
Display Mode Setting
Your clock has two display modes. Switch between showing time only, or a cycling view that rotates between time, date, and temperature.
How to switch: On the normal time screen, long press the + button to toggle between the two modes.
Mode
What it shows
① Time Only
Shows the current time permanently — clean and distraction-free.
② Cycle Display
Automatically rotates between time → date → indoor temperature every few seconds.
Use Cycle Display mode during the day to get all information at a glance. Switch to Time Only at night for a cleaner, calmer display.
05
Adjusting the Display Brightness
The clock has 5 manual brightness levels. There is no auto mode — you choose the level that suits your room.
How to adjust: On the normal time screen, short press the SNOOZE button repeatedly to cycle through all 5 levels.
Level
Description
Indicator
L-01
Dimmest — ideal for dark bedrooms at night
L-02
Soft glow — good for dim rooms
L-03
Medium — balanced for most rooms
L-04
Bright — good for well-lit spaces
L-05
Maximum — for bright daylight rooms
Bedroom tip: Set to L-01 at night for the most comfortable sleep. Also enable Night Mode (set during time setup, Step 8) for automatic dimming between 22:00 and 06:00.
06
Changing the Temperature Unit
By default, your clock displays temperature in Celsius (°C). You can switch to Fahrenheit at any time.
1
Be on the normal time display
Make sure you are not in any setup or alarm mode — just the regular clock screen.
2
Long Press the − Button
Hold − for 3 seconds. The display toggles between °C and °F instantly. Long press again to switch back.
For Indian users — Celsius (°C) is the standard in India. We recommend keeping it on °C so readings match your weather apps and daily familiarity.
07
Setting the Alarms
Your clock has two independent alarms — perfect for different family members, or a main alarm with a backup a few minutes later.
Step 1 — Enter Alarm Setup
1
Tap the Clock Icon Button to select an alarm
Tap the ⏰ button once — the Alarm 1 icon and its current state appear on the display. Tap again — Alarm 2 icon appears.
2
Turn the Alarm ON or OFF
Press + or − to toggle between AL-OF (off) and AL-ON (on). Press S to confirm and enter alarm time setup.
3
Set the Alarm Hour
Use + or − to set the hour. Press S to confirm.
4
Set the Alarm Minutes
Adjust to the exact minute using + or −. Press S to confirm.
5
Choose the Alarm Frequency
Select how often the alarm should ring using + or −, then press S to save:
| Code | Frequency | Best For |
|---|---|---|
| d-7 | Every day (daily alarm) | Daily morning wake-up routine |
| d-5 | Saturday & Sunday only (double weekend) | Weekend-only alarms |
| d-6 | Saturday only (single weekend) | Single day routine |
Step 2 — When the Alarm Rings
Short Press Any Button — Snooze
The alarm pauses briefly and rings again shortly after. Use this for a few extra minutes of sleep.
Long Press SNOOZE (3 sec) — Turn Off
Hold the SNOOZE button for 3 seconds to completely turn off the alarm and move to the next alarm state.
Set Alarm 1 as your main wake-up time and Alarm 2 as a backup 5–10 minutes later — perfect for heavy sleepers or families sharing one clock!
08
Quick Reference — All Settings at a Glance
A fast reminder of every button function on your clock, directly from the manual:
Feature
Button / Action
What Happens
Enter Time & Date Setup
Long press S (3 sec)
Enters full setup: 12/24H → hour → min → year → month → date → night mode
Switch Display Mode
Long press +
Toggles: time only ↔ time/date/temp cycle
Adjust Brightness
Short press SNOOZE
Cycles L-01 → L-02 → L-03 → L-04 → L-05
Change Temp Unit
Long press − (3 sec)
Toggles between °C and °F
Select Alarm 1
Tap ⏰ once
Shows Alarm 1 icon and state
Select Alarm 2
Tap ⏰ twice
Shows Alarm 2 icon and state
Snooze Alarm
Short press any button
Alarm pauses, rings again shortly
Turn Off Alarm
Long press SNOOZE (3 sec)
Alarm stops, enters next alarm state
Wake Screen (Battery)
Hold any key
Lights up display from auto-off
09
Common Problems & Solutions
Having trouble? Most issues have a simple fix. Tap any problem below to see the solution:
The display is not turning on at all
▼
If using USB: Check that the cable is firmly plugged into both the clock and the charger. Try a different USB adapter — the clock requires DC 5V.
If using batteries: Re-insert all 3 AAA batteries ensuring + and − match the markings inside the compartment. Try a fresh set of batteries if yours may be low.
If using batteries: Re-insert all 3 AAA batteries ensuring + and − match the markings inside the compartment. Try a fresh set of batteries if yours may be low.
The display went blank after a few seconds
▼
This is completely normal in battery mode. As per the manual, the screen turns off after 10–16 seconds to conserve battery. Simply hold down any key to light it up again.
If you want a permanently-on display, switch to USB power instead.
If you want a permanently-on display, switch to USB power instead.
The clock is showing the wrong time
▼
Long press S for 3 seconds to re-enter setup and correct the time from Step 1. Also verify that 12H or 24H is set correctly — selecting the wrong format can make the time appear 12 hours off.
The alarm is not ringing at the set time
▼
Check three things:
1. Alarm is ON: Tap the clock icon button and confirm it shows AL-ON (not AL-OF).
2. Correct frequency: Make sure d-7 (daily), d-5 (Sat & Sun), or d-6 (Sat only) matches today's day.
3. Correct time: Verify hour and minute are right. In 12H mode, AM/PM must also be correct.
1. Alarm is ON: Tap the clock icon button and confirm it shows AL-ON (not AL-OF).
2. Correct frequency: Make sure d-7 (daily), d-5 (Sat & Sun), or d-6 (Sat only) matches today's day.
3. Correct time: Verify hour and minute are right. In 12H mode, AM/PM must also be correct.
Temperature is showing in the wrong unit
▼
On the normal time screen, long press the − button for 3 seconds. This toggles instantly between Celsius and Fahrenheit. Long press again to switch back.
The date or month is showing incorrectly
▼
Long press S to enter setup and step through using the S button until you reach the Month and Date fields. Correct them with + or −, then press S to save. The clock exits automatically after the final confirmation step.
The display is too bright at night
▼
Two options:
1. Short press SNOOZE to manually cycle brightness down to L-01 (dimmest) at any time.
2. Enable Night Mode: Re-enter setup (long press S) and at the final step (Step 8), select S NO. The display will then auto-dim between 22:00 and 06:00 every night.
1. Short press SNOOZE to manually cycle brightness down to L-01 (dimmest) at any time.
2. Enable Night Mode: Re-enter setup (long press S) and at the final step (Step 8), select S NO. The display will then auto-dim between 22:00 and 06:00 every night.
The display only shows time — not date or temperature
▼
Your clock is in Time Only mode (mode ①). Long press the + button on the normal time screen to switch to Cycle Display mode (mode ②). The display will then rotate between time, date, and temperature automatically every few seconds.