Amplifier board size: 2.9x2.9CM pair power amplifier board can be used alone, or can be used as a pair box after TWS pairingWith call function, power on, the default volume is maximum5V: drive 2x4O3W6.5V: drive 2x4O5WColor: GreenMaterial: PCBVCC, GND: power supply pinsLN(-), LP(+): Left speakerRN(-), RP(+): Right speaker: The common terminal of the key, the other end of the key is connected to +, -, PREV, respectivelyAUXL, AUXG, AUXR: Audio inputAUXD: Audio input detection pin, the input low level switches to the audio input state"MATCH" button description:Step 1: Power onWhen the speaker is powered on for the first time, it will enter the single-speaker pairing state after more than ten seconds.If the two speakers are not powered on for the first time, and the master and slave have been set, they will automatically .: Master-slave settingsPress and hold the MATCH button for 1S, the speaker enters -to-box interconnection state, the LED light flashes at a of 200MS, and there is a prompt tone at the same timeStep 3: Automatically connect to The speakers enter -to-box state, and the two speakers are automatically connected. After connecting, the master and slave devices are automatically assigned. The master LED light flashes at a of 600MS, the slave LED lights are always on, and there is a prompt tone at the same time.Package Contents:2 x Amplifier BoardOnly the above package content, other are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.