Features Filterless Design: Filterless design, output with ferrite bead + capacitors. Very efficient, very suitable for portable and battery powered projects. 24db Fixed Gain: 24dB fixed gain, onboard trimmer potentiometer for input volume adjustment. Protection Function: Thermal and short-circuit/over-current protection, is easy to be install, don't need to use much time on installation. Low Current Consumption: 4mA quiescent, 1uA in shutdown mode. Deliver 2.5 Watts: Able to deliver 2.5 Watts into 4-8 ohm impedance speakers. Specification: Item Type: Audio Power Amplifier Module Output Power: Single Channel 2.5W Speaker Impedance: 4-8Ω Package List: 10 x Audio Power Amplifier Module 10 x Pin Header Package List 10 x Audio Power Amplifier Module 10 x Pin Header