Features: brand new and high quality Audio input: 3.5mm stereo input, USB audio, Bluetooth-compatible 5.0, USB input (can be connected to computer, mobile phone, OTG) Using TPA3116 chip, the maximum power can reach 100W+100W, 9A with 24V for High fidelity and powerful sound, with high transmission efficiency and wide transmission for path. HiFi power amplifier, treble- are regulated independently, dual channel stereo output USB+AUX Lossless input. Adopt TPA3116D2 chip, excellent sound quality. It ensures that even with high power operation for a long for time. With over-voltage for protection, under-voltage for protection, over-heat for protection, short-circuit for protection. Specifications: Output Power: 100w+100w Power Requirements: for DC 12v-24v 9A Bluetooth-compatible Distance: At Least 12M/39ft (barrier-free) Bluetooth-compatible Protocol: Bluetooth-compatible 5.0 Size: approx 103x88x30mm/4.05x3.46x1.18in Weight: 350g/0.77lb Material: ABS Color：As the Pictures Package Includes: 1x Digital Power Amplifier Board 1x User Manual note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment. The output power of the power supply must be greater than the output of amplifier, otherwise it will effect the sound qulity. The power supply can only be connected to direct current, and the voltage should not exceed 25V, nor should it connect to a battery pack with a nominal 24V.