Power Amplifiers descriptions： We use high-quality raw materials, all materials are very suitable for the product, please rest assured to buy. 2.1 Bluetooth Digital Power Amplifier Board -100w, 2 Channels. Specifications: Name:TPA3116D2 2.1 Bluetooth Digital Power Amplifier Board Chip Type:TPA3116 D2   Chip Protection: over Voltage, Under Voltage, Overheating, DC Detection and Short Circuit Operating Voltage Range: DC 11-25V (current 3-4A or More, the Proposed 19-24V / 4-5A Above), Audio Input Sensitivity: 600-800mV, Frequency Response Range: 20Hz-20KHz, Speaker Impedance: Left and Right Channel Speakers: 4-8 Ohm, Bass Speaker Impedance: 2-8 Ohm, The Maximum Output Power: 50W (left Channel) +50 W (right Channel) +100 W (subwoofer), Maximum Output Power: 100w (2 Ohm Speakers Connected) Number of Channels: 3-channels Size: 100* 100 * 22mm Package Include: 1 X Assembled Digital Amplifier Board TPA3116 -100W 2 Channels . Products number : SOMONO156701