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 resistanceIt supports Bluetooth audio input and the maximum receiving distance is 10 metersDual channel of 15W+15W power output and a wide input voltage range from 10V to 25V DCSound quality is very good by using this audio power amplifier moduleApplicable speaker impedance are 4/6/8/10 ohm, great for turning normal speaker into Bluetooth speaker 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 15W+15W 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 4/6/8/10 ohm, great for turning normal speaker into Bluetooth speaker. Specifications: Audio Input: Bluetooth Bluetooth Maximum. Distance: 10 meters Output Power: Dual channel (15W+15W) Suitable Impedance: 4, 6, 8, 10 ohm speaker Input Voltage: 10~25V DC (suggest 12V DC, 2A above; speaker power is less than 12V DC, 1A) Power Source Connector: 2.54mm, 3PIN Speaker Connector: 2.54mm, 2PIN Size: 58 x 38 x 10mm / 2.28 x 1..49 x 0.39" Package Includes: 1 x Amplifier Board