It is a powerful BT 5.3 HiFi stereo amplifier . Remote control is designed to control total volume of treble and bass to meet your more needs. The supports BT/U-Disk/3.5mm AUX input, suitable for most home passive speakers. Using two low-distortion TPA3116 high-performance chips to display ultra-high-definition sound quality. Small and simple design, built-in speaker protection circuit, suitable for bookshelf/computer/desktop/speaker . In order to facilitate operation of remote control, we gave up cheap potentiometer and chose a better encoder. (To avoid tuning between remote control and encoder, we gave up scale adjustment and chose to use prompt sound to indicate maximum volume.) SNR: 95dB : Less than 1%(±1 dB) Wireless Chip: BP1048B2(Built-in op amp processing) Terminating Impedance: 2-8 Ohm Input Sensitivity: 1500mV DC Input Range: DC 12-24V U-Disk Capacity: Max 128GB Max Power Output: 100wattx2 Input Interface: BT/U-Disk/AUX Power Amplifier Chip: TPA3116x2 Power Adapter: 24V/5A/24V/10A Frequency Response Range: 15Hz- 20KHz Support Format: MP3 / WMA / APE / FLAC / WAV Wireless Transmission Distance: BT 5.3, up to 131ft/40m Output Interface: Speaker's Output Output: Passive Speakers, Amplifier Plug Type:EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on Voltage:AC100-240V Color: Green & Black Material: Aluminum Alloy Package Contents: 1 x Bluetooth Audio Amplifier 1 x Remote Control 1 x Antenna 1 x AC cable 1 x 24V 5A adapter Only above package content, other products are not included. Note: Light reflection and different displays may cause color of item in picture a little different from real thing. The measurement allowed error is +/- 1-3cm.