TPA3116D2 HIFI chip solution: stereo dual-channel output, to continuous serial high-power operation, less than or equal to 0.1%. Wide voltage input DC: 12-24V; Bluetooth and AUX function: Bluetooth 5.0 version, the transmission distance is longer. The transmission distance can reach 49 feet in an open environment. If your playback device does not have Bluetooth, you can also input audio signals through a 3.5 mm headphone plug. ; Treble and bass control: If you are tired of your own high and low bass, why not try the high and low control knobs! This will make you feel like in a movie theater. ; protection: This current board has overheat protection, reverse protection, circuit protection, overvoltage and undervoltage protection; Product feature description: 1. TPA3116D2 is a Class D power amplifier IC launched by TI with very high index parameters. The highest modulation frequency can reach 1.2MHZ, and the high power output distortion rate is less than 0.1% 2. Various interface signs have been added to the cool black shell, which can be connected correctly without the manual. Plug Type:US Plug,it applies to Canada, India,Mexico, Thailand, the , the Philippines,Taiwan and so on. colour: black Material: plastic size: 118x100x22mm Package Contents: 1*-TB21 TPA3116D2 Bluetooth 5.0 Subwoofer Amplifier Board 1*US plug Warm reminder: The power switch on the circuit board is a standby switch. After turning off the switch, the machine is in a low-power standby state. In order to completely shut down or unplug the power, you can unplug the DC plug on the machine. Appropriately increasing the voltage or reducing the speaker impedance can effectively increase the output power. Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.