1. Remote controlled volume switch 
2. Full-range speaker with clear sound quality 
3. Automatic music playback with 3.7-5V DC power supply
4. Durable acrylic shell
5. Perfect for contact welding and DIY production training

Parameters:
Sound channel output: 2 channels
Output power: 3w 3w
Supply voltage: DC 4.2-5V voltage 5V beyond will damage the module
Rated current: 1.5A-2A

Wiring instructions: white terminal to the speaker red terminal to the power supply

Bluetooth operation: open the cell phone Bluetooth, you can directly scan the device, find "XC
046 Click to connect. After disconnecting Bluetooth, it will automatically switch to u disk.

Circuit function:
Bluetooth module red terminal is 5V power supply, white terminal for the speaker left and right sound channel red line is positive , black is negative -. With the music or other sounds, LED lights will follow the rhythm of the sound (the sound of fast and slow size flashing up. After the successful welding you can feel the beautiful melodic combination of sound and light. Circuit principle: sound-controlled LED melody light circuit by the power supply circuit, microphone amplifier circuit, LED light-emitting indicator circuit, the power supply using two batteries. MIC will be converted from sound signals into electrical signals, amplified by C2 coupling to Q1, the amplified signal sent to U1 by U1 to promote the LED light, the louder the sound, the higher the brightness of LED flow faster.

Attention:
Spare parts are all need to install themselves. Shell paper torn off is transparent. The whole set of Bluetooth speaker kit has been equipped with USB power cord, Bluetooth circuit board are welded, only need to connect the line and assembly sound control board can be used, power supply can use cell phone charger or computer 5V power supply, use the current 2A power supply sound quality better.

Warning tips: please use strictly in accordance with product instructions incorrect use and wiring can cause the amplifier can not be used properly or damage the amplifier.