Features:We have enhanced the output power and improved its functions while still maintaining its mini size and elegant design. The output power of the upgraded chip TPA3116 can be increased to 100W (50W * 2). You will be surprised at its output power. AUX/USB/BT input is supported. You can appreciate music in different ways. BT function has also been upgraded. Now it's more stable and faster. Music can be played lossless (just like connecting to a computer) via USB input. No need to install the driver. You will be surprised by the sound quality. Specification:BT connection distance: 10m or shorterBT Version: 4.0 + EDR Rated power: 50W * 2Channel: 2.0Impedance: 4 - 8OhmAUX Input: 3.5mm Stereo Power source: DC9V-24V Package List: 1 * NS-01G Amplifier1 * AUX Input Wire 1 * RCA Audio Cable1 * English Manual1 * Power Source .