Description:Stereo amplifier board finished board kit can connect the audio signal of mobile phone, laptop and tablet to the output of stereo power amplifier through 3.5mm audio cable.Features:1. The power switch and volume knob are integrated. When the sound is adjusted to the minimum, turn it counterclockwise. When you hear a clicking sound, it is turned off. Turn clockwise to turn it on.2. Powered by the micro 5p interface, the ordinary mobile phone charger 5V2A charging cable can be used.Specification:Parameters: 4 Euro 2x5WPower interface: micro 5p (reserved 2.5mm welding port)Input voltage: 3.7V-5VAmplifier working mode: switchable class AB and class DSignal-to-noise ratio: 90DBTHD+N:-70DBCrosstalk: -86dbDNR: 91dbOutput Interface:Speaker output port * 2 groups (one group for left and right channels), it is recommended to ohm 5W-50W power speakers to useUsers can freely switch between CLASS AB or CLASS D working modes according to sound preference and power collocation.Packing list:Stereo amplifier board*1Audio cable*1USB power cable*1Note:1.Due to the lighting effects and shooting angles, there is color difference in the product, please understand.2.Due to manual measurement, there is a tolerance in the product size.