Amplifier board size: 2.9x2.9CMThe box pair amplifier board can be used alone, or can be used as a pair box after TWS pairingWith call function, on, the default volume is maximum5V: drive 2x4O3W6.5V: drive 2x4O5WColor: GreenMaterial: PCBVCC, GND: supply pinsLN(-), LP(+): Left speakerRN(-), RP(+): Right speakerCOM: The common terminal of the key, the other end of the key is connected to VOL+, VOL-, 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: 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 reconnect.Step 2: Master-slave settingsPress and hold the MATCH button for 1S, the speaker enters the box-to-box interconnection state, the LED light flashes rapidly at a cycle of 200MS, and there is a prompt tone at the same timeStep 3: Automatically connect to the boxThe speakers enter the box-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 cycle 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 products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.