Many cheap clocks force you to reset alarms daily. The BTC2138 allows setting Alarm 1 for weekdays, Alarm 2 for weekends. Very practical.
| Issue | Solution | | :--- | :--- | | No Sound | Ensure the volume is turned up. Check that the unit is not in Standby mode. | | Bluetooth won't connect | Ensure the device is within range (approx. 10 meters). Try "forgetting" the device in your phone's Bluetooth settings and re-pairing. | | Radio reception is poor | Fully extend the FM wire antenna located at the back of the unit. Move the antenna to different positions to find the best signal. | | Clock reset to 12:00 | This indicates a power outage occurred and the backup batteries are missing or dead. Replace the AAA batteries. | | Alarm didn't go off | Check that the Alarm Icon (AL1 or AL2) is visible on the display. Ensure the volume is not set to zero. |
The Thomson BTC2138 is a “jack of all trades, master of none.”
It packs Bluetooth, dual alarms, and a dimmer into a cheap package. But critical flaws – no alarm battery backup and weak USB charging – make it unsuitable as a primary alarm for anyone with a serious schedule.
Recommendation:
Final note to Thomson: Update the manual to clearly warn users about the lack of alarm backup. The current fine print is misleading to casual buyers.
This model is designed as an all-in-one bedside hub with the following highlights:
0.35W RMS speaker with Bluetooth V2.1 for wireless music streaming. PLL FM tuner with 20 programmable station presets. 0.9-inch red LED display with a Hi/Lo dimmer for night use.
Dual alarm settings with wake-to-buzzer or wake-to-radio options. Convenience:
Built-in white night light and a USB port for charging mobile devices.
AC adapter with a battery backup slot (2 x AA batteries, not included) to maintain settings during power outages. Grays Auction Operating Instructions 1. Setting the Clock Time Ensure the device is in Standby Mode (radio off). Press and hold the TIME SET / MEMORY button until the display digits begin to blink. HOUR / REVERSE button to adjust the hour and the MINUTE / FORWARD button to set the minutes.
button again or wait for the blinking to stop to save the time. 2. Configuring the Dual Alarms You can set two independent alarms (AL1 and AL2). In standby mode, long-press the button until the time blinks. Use the buttons to adjust your wake-up time. Toggle Alarm: Short-press the
button to turn the alarm on or off. An indicator light next to the alarm number will confirm it is active. Wake Source:
Most models allow you to cycle through the alarm mode (Buzzer vs. Radio) by repeatedly pressing the alarm button. 3. Using Bluetooth & Radio Bluetooth Pairing: thomson bluetooth digital alarm clock radio btc2138 manual
Switch the mode to Bluetooth. Search for "BTC-2138" on your smartphone or tablet to pair and stream music wirelessly. STANDBY/ON button to turn on the radio. Use the buttons to tune into frequencies. To save a station, tune to your frequency and long-press . To cycle through saved stations (P01–P20), press the 4. Night Light & Dimmer Snooze/Dimmer:
The top button serves as both a snooze (delaying the alarm for 9 minutes) and a dimmer to adjust the LED brightness between High and Low. Night Light:
Activate the integrated white night light using its dedicated control button for subtle bedside illumination. Grays Auction Maintenance and Troubleshooting Battery Backup:
Always keep two fresh AA batteries in the compartment to avoid resetting your clock and alarms after every power flicker. Radio Reception:
Fully extend the pigtail FM antenna and reposition it if you experience static. The USB port is for charging only ; it does not support music playback from thumb drives. Grays Auction or tips on optimizing FM radio reception THOMSON CR50 Alarm Clock Radio Instruction Manual
The Thomson BTC2138 is a Bluetooth FM clock radio that features a large LED display, dual alarms, and USB charging capabilities. While the exact full manual for the
is often packaged with the device, it shares a standardized interface with other Thomson models like the CR50. Quick Setup Guide
Power On: Plug the DC adapter into the back of the unit and a wall outlet.
Backup Power: Insert 2 x AA batteries (not included) into the bottom compartment to maintain settings during power outages.
Antenna: Fully extend the FM wire antenna located at the back for clear radio reception. Clock & Alarm Functions
To adjust these settings, the device must be in Standby Mode (powered on but not playing music). Set Time:
Long-press the TIME SET / MEMORY button until the display blinks. Many cheap clocks force you to reset alarms daily
Use the HOUR button to set the hour and the MINUTE button for minutes. Press TIME SET again to confirm. Set Alarms (1 or 2):
Long-press the ALARM 1 (or ALARM 2) button until the time flashes. Use the HOUR and MINUTE buttons to set your wake-up time.
Press the ALARM button again to choose your wake-up source: Radio (frequency shows) or Buzzer ("bU" shows).
Toggle Alarm ON/OFF: Short-press the ALARM button; a light on the display indicates if the alarm is active. Bluetooth & Audio Bluetooth Pairing: Press the SOURCE
or POWER button to switch to Bluetooth mode (the display typically shows "bt" or a flashing Bluetooth icon). On your phone/tablet, search for or Thomson in the Bluetooth settings and select it to pair.
FM Radio: Use the SCAN or FORWARD/REVERSE buttons to find stations. You can save up to 20 presets using the MEMORY button.
Sleep Timer: Press the SLEEP button repeatedly to choose a countdown (90, 60, 30, etc. minutes) before the radio turns off automatically. Display & Charging
Dimmer: Use the SNOOZE / DIMMER button to toggle between High, Low, or Off brightness levels.
USB Port: The USB port on the back is for charging only; it does not play music from USB sticks.
The Thomson BTC2138 is a dependable, budget-friendly bedside companion that nails the basics of a digital alarm clock. While its interface has a slight learning curve, its performance as a radio and charger makes it a versatile choice for any nightstand. đź“» Key Features & Performance
FM Digital Tuner: Clean reception with 20 programmable station presets.
Dual Alarm System: Set separate wake-up times for you and a partner. The Thomson BTC2138 is a “jack of all
Bluetooth Connectivity: Easily streams music or podcasts from your phone.
USB Charging Port: Features a built-in port to juice up your devices overnight.
Dimmable Display: Large LED digits with adjustable brightness to prevent "blue light" sleep disruption. 🛠️ The Setup Experience (The Manual)
The most common critique of the BTC2138 is its initial setup. Because the device uses multi-function buttons, the physical manual is essential for your first run.
Time Sync: You must hold the 'Mode' button to enter clock-set.
Alarm Modes: You can choose between a standard buzzer or your favorite FM station.
Bluetooth Pairing: Fast and stable, though it requires manual switching to "BT" mode first. ✅ Pros and ❌ Cons The Good Small footprint saves desk space. The USB port eliminates extra wall adapters. Sound quality is surprisingly crisp for its size. The Not-So-Good Button layout is not intuitive in the dark.
Manual is required to understand specific button "long-press" functions.
Backup battery (CR2032) only saves settings; it won't power the display during a blackout. đź’ˇ Final Verdict
The Thomson BTC2138 is perfect for users who want a multi-functional alarm without the complexity of a smart speaker. Once you get past the initial manual-guided setup, it provides a reliable, all-in-one bedside solution. If you need help with a specific step, let me know: Are you stuck on setting the time? Do you need help pairing Bluetooth?
I can walk you through the exact button sequence for any feature.
Note: Since I cannot physically test the unit, this review synthesizes information from the manual’s technical specifications, common user feedback from electronics forums, and comparative analysis with similar products (e.g., Sony, Magnasonic, and Loftek models).
A common complaint in user feedback regarding the Thomson BTC2138 is that the display is too bright for a dark bedroom.