powerful BT 5.3 HiFi stereo amplifier . Remote control is designed to control the 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 the operation of the remote control, we gave up the cheap potentiometer and chose a better encoder. (To avoid the tuning between the remote control and the encoder, we gave up the scale adjustment and chose to use the prompt sound to indicate the maximum volume.) : 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 Colour:Photo Color Material:Aluminum Alloy Package Contents: 1 x Bluetooth Audio Amplifier 1 x Remote Control 1 x Antenna 1 x English instruction manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.