Power Amplifiers descriptions： We use high-quality raw materials, all materials are very suitable for the product, please rest assured to buy. Mini Bluetooth-5.0, Digital Power Amplifier And Music Player. Features As a Digital Power Amplifier & Music Player, It Supports RCA/AUX/USB/BT 5.0/TF Card Inputs, Almost Compatible with All Home Audio Device Such As Phone, Tablet, Computer, TV, Set-box, CD Player Etc. U-disk and TF Card Support WAV, APE, FLAC Lossless Formats. USB Interface Supports U-disk, Computers (no Need for the Driver) and Phones (with OTG Function) Input. Bluetooth 5.0 Achieves Stable and Faster Transmission Speed, TF Card Makes It Convenient to Enjoy High-quality Music Even on the Road or Outdoor. Adopting Classic TPA3116 Chip, the Max Output Power Can Reach 50W*2, Enough for Most Home Desktop/bookshelf/indoor Passive Speakers(4-16). The Sound is Clear and Clean Without Any Audible Noise Even at High Output. Compact Design and Exquisite Appearance, Attractive Chassis with LED Display and Power/mode Switch, Very Suitable for Home and Desktop Audio System Use. DC 9-24V Wide Voltage Makes It Possible to Be Used in Car or Motorcycle. Specifications: Bluetooth: 5.0 Version Audio Inputs: RCA / 3.5mm AUX / Bluetooth / USB / TF Card Audio Output: Banana Speaker Jacks U-disk/TF Card Supporting Format: MP3, WAV, APE, FLAC Max U-disk / TF Card Storage: 128G Max Output Power: 50W*2 (24V/4 Load) Speaker Impedance: 4-16 Frequency Response: 20Hz-20KHz Working Voltage: DC 9V-24V Dimensions (L*W*H): 110*90*50mm / 4.33*3.54*1.97in Net Weight: 220g / 0.49lb Package Weight(without Power Supply): 460g / 1.01lb Package Weight(with Power Supply): 740g / 1.63lb Packing List 1× Digital Power Amplifier 1× 19V Power Supply(optional) . Products number : SOMONO156694