bluetooth 5.0 Lossless Transmission Stable signal, long transmission distance (up to 12m), intelligently compatible with 99% of devices Pure copper gold-plated terminals to strength the stability and accuracy of audio transmission signal Proper size and attractive appearance Supports multiple inputs (AUX/USB/bluetooth/USB Stick/TF Card). The USB port supports both computers (no driver is required) and phones, pad (with OTG function), It can provide you almost all methods that you want to enjoy your music. It offers you great listening experience even at a very low price, the volume knob adopts expensive encoders instead of normal potentiometer to avoid noise when adjusting volume. Hi-Fi sound and Powerful HiFi clear and clarity sound, no audible noise, our engineer spent a lot of time and efforts to optimize the circuit to ensure it has no noise even at the maximum output power. 100W (50W x 2) MAX output power, which can drive most home speakers. bluetooth: 5.0 Version, MAX 12M distance Audio Inputs: 3.5mm AUX or bluetooth or USB or RCA or TF card or USB Stick Audio Outputs: Banana Speaker Jacks Power Amplifier Chip:TPA3116 Output Power: 50W x 2 (24V/4 Ohm load) Speaker Impedance: 4 Ohm -16 Ohm Frequency Response: 20Hz-20KHz( +/- 1dB) SNR: 98dB Power Supply: DC9V-24V (the voltage can not over 24V) Size: (W)110 x (H)90 x (D)50mm Net Weight: 160g Power supply: support 5.5 x 2.1-2.5mm Package Included: 1 x Amplifier(power supply not included)