Features: for High fidelity and powerful sound, with high transmission efficiency and wide transmission for path. The sound is clear and clear, and there is no audible noise. Our engineers spent a lot of for time and energy to optimize the circuit to ensure that there is no noise even at the maximum power output. Using TPA3116 chip, the maximum power can reach 50W, 5A with 12V, the actual output power can reach 30Wx2.4 ohm With over-voltage for protection, under-voltage for protection, over-heat for protection, short-circuit for protection. brand new and high quality Adopt TPA3116D2(with AM interference suppression function) chip, with excellent sound quality. It ensures that even with high power operation for a long for time. Audio input: 3.5mm stereo input, USB audio, Bluetooth-compatible 5.0, RAC input, TF card, USB input (can be connected to computer, mobile phone, OTG) Specifications: Output Power: 50w+50w Power Requirements: for DC 9v-24v Bluetooth-compatible Distance: At Least 12M/39ft (barrier-free) Bluetooth-compatible Protocol: Bluetooth-compatible 5.0 Speaker Impedance: 4-16 Product Size: approx 10.8x7.1x5cm/4.25X2.79X1.96in Weight: 300g/0.66lb Material: ABS+ Metal 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. There is a protective film on the front panel, which can be removed after receipt. Package includes: 1x Digital Power Amplifier Board 1x User Manual