Features: Built-in bluetooth-compatible Receiver and FM radio function. Support Voltage AC110V/ 220V or DC12V/ 24V. Support reading MP3 songs in TF card / U-disk. Independent adjustment of Treble, Bass and Master volume. Dual-microphone input, adjustable reverb-.With AUX- input port, can be connected to the PC/Phone/CD. Specifications: Type: Bluetooth-compatible Amplifier Board Model: D100K Bluetooth-compatible Version: BT5.0 Audio- Channel: 1.0 Rated-impedance: 4 Rated-Power: 40W Power Range: 30-120W (Deponds on Voltage-) Battery of Remote: CR2025 x1(Not Included!) Feature: FM Radio / Treble / Bass Voltage: AC110/220V, DC12V/24V Input: Bluetooth-compatible/3.5mm RCA/U-Disk/TF/MIC- Size:approx195x85mm/7.68x3.35in Plug-Type:EU/ US/ UK / AU Note: Please allow 0-1cm 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 includes: 1 x Bluetooth-compatible Amplifier Board 1 x Remote Control 1 x AC-Power Cable 1 x DC-Power Line 1 x Speaker Connecting Line