Features: 100% brand new and high quality Compatible with blue-teeth 5.0, AUX input, U drive play, USB sound,Hifi qaulity, App control. 5.0 blue-tooth version, the transmission efficiency is higher, the transmission distance is farther. 2.0 channel stereo output power 100WX 2, working voltage range DC5-24V for 4-8, 20-200watt passive speakers.. With volume control and power switch, Ideal for DIY your passive speakers. This blue-tooth amplifier board has a bottom plate and a top plate, support reverse connection protection, Over-voltage protection, under-voltage protection, Over-heat protection, Short-circuit protection. Package Includes: 1x Power Amplifier Board 1x Manual Specifications: Material: Alloy Size: 98x70x25mm/ 3.85x2.75x0.98 in note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.