User Guide for Trevi DJ 12E42 BT Bluetooth Headphones
Quick guide for the Trevi DJ 12E42 BT Bluetooth headphones. Learn how to pair, charge, use playback controls, manage calls, and use the MicroSD, FM radio, and wired modes.
Table of contents
Quick guide from the manual
This document provides essential instructions for operating the Trevi DJ 12E42 BT headphones. Key features include Bluetooth connectivity, MicroSD card playback, FM radio (on export versions), and a wired 3.5mm connection. Ensure the device is charged before first use and follow the pairing procedure to connect to your smartphone or tablet.
Description of Controls

- 1. USB Type-C Charging Socket: For battery charging.
- 2. 9 key: Previous song / Volume down.
- 3. Power/Play/Call key: Power On/Off, Play/Pause, Answer/End/Reject calls.
- 4. : key: Next song / Volume up.
- 5. Microphone: For hands-free calls.
- 6. microSD Card input: For MP3 playback.
- 7. LED indicator: Status light (Red/Blue).
- 8. 3.5mm Audio Jack: For wired connection.
Battery Charging
The headphones feature an internal rechargeable battery. Charge for 3-4 hours before the first use.
- Connect the included USB/USB Type-C cable to the headphones and an external USB power source (5V).
- The LED indicator (7) will turn red during charging.
- The LED indicator (7) will turn blue when charging is complete.
Note: When the battery is low, you will hear a "Battery low" voice message before the device automatically turns off.
Power On and Off
- Turn On: Press and hold the Power key (3) for a few seconds until you hear "Power On".
- Turn Off: Press and hold the Power key (3) for a few seconds until you hear "Power Off".
- Auto Turn Off: The headphones will turn off automatically after a period of inactivity if not paired.
Pairing with a Bluetooth Device
- Turn on the headphones. The LED (7) will flash blue and red.
- The voice guide will announce "Bluetooth mode".
- Enable Bluetooth on your external device (phone/tablet) and search for "DJ12E42BT".
- Select the device to pair. The voice guide will announce "Connecting".
Music Playback and Volume
- Play/Pause: Press the Power key (3).
- Next Song: Press the : key (4).
- Previous Song: Press the 9 key (2).
- Increase Volume: Press and hold the : key (4).
- Decrease Volume: Press and hold the 9 key (2).
Call Handling
- Answer a call: Press the Power key (3) once.
- End a call: Press the Power key (3) once during the conversation.
- Reject an incoming call: Long press the Power key (3).
- Redial last number: Quickly press the Power key (3) twice.
MicroSD and FM Radio
To switch modes, turn on the device and press the Power key (3) three times until the voice guide announces the desired mode:
- MicroSD: Insert the card into the slot (6) with contacts facing outward. Select "Play by TF card".
- FM Radio (Export version only): Select "FM mode". Press the Power key (3) to start automatic station storage. Use the track keys (2, 4) to navigate stations.
Wired Connection
You can use the headphones as a passive device by connecting them to an external audio source using a 3.5mm stereo jack cable. Music playback is controlled by the connected device.
Technical Specifications
- Bluetooth Version: V5.3
- Working Distance: 10m
- Battery: Rechargeable Lithium 3.7V, 300mAh
- Charging Voltage: 5V
- Weight: 157g
Battery Safety and Disposal
Warning: Battery removal should only be performed by qualified personnel. Do not dispose of batteries in household waste, fire, or water. Recycle according to local regulations.
Manufacturer information
TREVI S.p.A.
Practical help
Common problems
Ensure devices are within 10 meters of each other. If the connection fails, re-pair the devices from step 1.
You will hear a 'Battery low' message. Charge the device using the included USB-C cable until the LED turns blue.
Before use
- Charge the headphones for 3-4 hours before the first use.
- Ensure the device is within 1 meter during the initial Bluetooth pairing process.
- Check that the MicroSD card is inserted with the contacts facing outward.
Specs in practice
- Bluetooth V5.3
- The latest standard for a stable and efficient wireless connection.
- 300mAh Battery
- Provides approximately 10 hours of music listening time.
Images and diagrams
- The control panel features the USB-C charging port, volume/track buttons, power/play button, microphone, MicroSD slot, and 3.5mm audio jack.
Model compatibility
- Bluetooth compatibility may vary with some devices due to the continuous evolution of technology.
- The FM Radio feature is only available on the export version of this product.
Manual page author
David Miller
Documentation analyst
Organizes user manual content into clear summaries, with attention to model details, product context, and everyday usability.