Description:This is an audio power amplifier board that strengthens low-power, inaudible electronic audio signals such as the signal from radio receiver or electric guitar pickup to a level that is strong enough for driving loudspeakers or headphones. Power amplifiers make the signal audible to listeners. It is the final electronic stage in a typical audio playback chain before the signal is sent to the loudspeakers and speaker enclosures.Features:Digital amplifier has a higher overload capacity than analog amplifier, and it won't cause crossover distortion, transient inter modulation distortion and you don't have to worry about the loudspeaker internal resistance.It supports Bluetooth audio input and the maximum receiving distance is 10 meters.Dual channel of 15Wand15W power output and a wide input voltage range from 10V to 25V DC.Sound quality is very good by using this audio power amplifier module.Applicable speaker impedance are 4 or 6 or 8 or 10 ohm, great for turning normal speaker into Bluetooth speaker.Specifications:Audio Input: BluetoothBluetooth Max. Distance: 10 metersOutput Power: Dual channel (15Wand15W)Suitable Impedance: 4, 6, 8, 10 ohm speakerInput Voltage: 10-25V DC (suggest 12V DC, 2A above speaker power is less than 12V DC, 1A)Power Supply Connector: 2.54mm, 3PINSpeaker Connector: 2.54mm, 2PINSize: 58 x 38 x 10mm or 2.28 x 1..49 x 0.39"Package Includes:1 x Amplifier Board.