1Adopts copper DC female head and fencetype terminal, can bear large current, convenient for wiring, not easy to short circuit. 2Potentiometer can adjust the volume, convenient to control the volume, very suitable for DIY speakers. 3With two audio source input methods, AUX and for Bluetooth, and supports HIFI sound quality. 4The digital amplifier module has a large heat dissipation area and is easy to install and use. 5Supports overvoltage, undervoltage, overheating, DC detection, and short circuit protection functions. Condition: 100% Brand New Item Type: Amplifier Board Material: Printed Circuit Board Product Model: ZK-1002 Chip Scheme: TPA3116D2 (With AM Interference Suppression Function) With Or Without Filter: LC Filter (The sound is more round and clear after filtering) Adapted Power Supply Voltage: 5-27V (Optional 9V/12V/15V18V/24V and other adapters, high power recommended high voltage) Adapted Speakers: 50W-300W, 4-8 Channels Number: Left and Right Dual Channels (Stereo) For Bluetooth Version: 5.0 For Bluetooth Transmission Distance: 15m / 49.2ft (Unobstructed) Protection Mechanism: Overvoltage, undervoltage, overheating, DC detection, short circuit protection Product Size: Approx. 84x52x24mm / 3.3x2.0x0.9in 1 x Amplifier Board1 x Upper Cover1 x Accessory Kit