Parameters: Audio inputs: Bluetooth / USB(Type-C) / 3.5mm AUX Audio output: Banana Speaker Jacks Bluetooth Version: 5.0 Max output Power: 50W*2 (24V/4? load) Speaker Impedance: 4?-16? Working voltage: DC 9V-24V Power specification: 5.5mm / 2.1-2.5mm Frequency Response: 20Hz-20KHz(±1dB) SNR: ?98dB Dimensions(H*L*W): 60*40*55mm / 2.36*1.57*2.17in Net Weight: 135g / 0.30lb Package weight: 175g / 0.39lb Package weight (with accessories): 450g / 0.99lbWarm tips: 1. 12V/5A power supply is optional, if you want higher output please prepare larger power supply by yourself or click: LINK to buy. And USB input doesn't apply to all mobile phones. 2. Output power of power adapter below 50W may result in the amp's auto off. And its Bluetooth cannot be searched and connected if the USB or AUX audio cable isn't pulled out.Packing List: 1× Digital Amplifier 1× Manual 1× Power Supply 1× Type-C USB Cable 1× 3.5mm AUX Cable