Features 1. 2-in-1 audio experience: high-quality speakers + F? function, mobile phones easily connected, enjoy music 2. Convenient FM function: automatic search and memory channels, power off to resume playback, convenient entertainment 3. Multi-colour LED music light effects: 12 LEDs flash with music, digital display shows mode, volume and frequency. 4. Multi-function remote control: Equipped with a remote control to adjust the volume, mode and channel, DIY assembly is fun! 5. powerful bluetooth and output: wireless bluetooth, USB/SD card playback, high power output, external speakers more shocking! Specification Product name: Bluetooth 5.0 speaker with voice-activated level indicator (bulk) Working voltage: DC DC5V (can use 5V1.5-2.1AUSB charger power supply) Working current: recommended.2A or more Main functions: Bluetooth 5.0 reception, USB, SD card insertion, FM radio playback, voice calls, AUX input Output power: 2.0 dual-channel 3WX2 Rated power: 5W Frequency Response: 4KHz Total harmonic distortion: 3% Signal-to-noise ratio: 3dB Rated impedance: 3 Description: Bluetooth name: JQ-BT, open the mobile phone or tablet Bluetooth search and pairing connection can be. FM radio need to add welding antenna, you can find a suitable wire soldered to the antenna welding point, disc in the chassis to increase the radio sensitivity. Level indicator consists of four LM358 main control chip 12 LEDs, adjustable sensitivity, you need to weld, welded from the Bluetooth board to take 5V power supply can work. When there is a music signal LED lights from the middle to the two sides flashing. Welding method and precautions: Acrylic shell has a protective film, tear off the protective film before assembling, and figure out the position of each board, and then install the speaker, circuit board, and finally assembled. Adjustable resistors for adjusting sensitivity are welded on the back of the PCB and exposed after mounting the shell, so that it is easy to adjust the sensitivity at any time. Components should be welded from short to high, pay attention to distinguish between positive and negative poles. Electrolytic capacitors, light-emitting diode polarity: long foot is positive, short foot is negative. Welding is completed to fully check whether there is a false weld or short circuit, to confirm that there is no error and then power on the test. The positive and negative poles of the power supply must not be reversed, otherwise the chip will be burned once the power is turned on. Package includes 1 x Bluetooth speaker loose parts