Attenuation range: 0 to -79dB, with a step size of 0.5dB; Working voltage: 3.3 to 5V;Low power consumption;Low signal noise: Signal-to-noise ratio >100dB (A-weighted);Stereo separation >100dB;The volume of the two channels can be adjusted separatelyConnect to the power supply: Ground is connected to the negative terminal of the power supply, and 5V is connected to the positive terminal. The power supply voltage should be +5V. Corresponding to the silk-screened ground on the board, 5V.Connect audio signal input: Connect the left channel, right channel, and the negative terminal of the audio respectively, corresponding to the left channel input, right channel input, and audio ground printed on the board.Power amplifier output terminal inside the board: Mark 5 and 6 respectively to connect the left channel to the power amplifier. The right channel is connected to the power amplifier to form the power amplifier output within the board.Connect the negative left output to the negative terminal of the left channel speaker and the positive left output to the positive terminal of the left channel speaker. The negative of the right output is connected to the negative terminal of the right channel speakerColor: BlueMaterial: plasticPackage Contents:1*Electronic Volume Adjustment Controller moduleOnly 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.