Features: Bluetooth-compatible 5.0.Can be connected with Bluetooth-compatible devices in wireless way, practical and convenient. Freely to adjust the , treble and sound volume according to the practical situation. Compact and mini, not occupying much installation space. Digital screen shows you the related data clearly by red light number. The amplifier is widely suitable for computer, tablet, laptop, for smart phone and so on. Description: Color: Black Power Voltage: 12V Bluetooth: 5.0 Output power: 20w+20w Impedance: 4-16 Bluetooth-compatible distance: 10 meter Input: Supporting for SD, u disk, USB, RCA stereo Size: 12.5*7.5*4cm/ 4.91*2.95*1.57inch(L*for W*H) Quantity: 1 Set Note: Please allow 1-3mm 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. Thank you! Package Contents:(Without retail package) 1 x Power Amplifier 1 x Remote Controller 1 x Manual