HIFI Stereo High quality dual channel power amplifier board for HIFI music. With AUX and Bluetooth two audio input methods, 2-in-1. 5.0 Bluetooth version, the transmission efficiency is higher, the transmission distance is farther. With a filter inductor, the sound is round and clear.     Protection Mechanism The TPA3116D2 devices feature short-circuit and thermal protection as well as overvoltage, undervoltage, and DC protection to prevent total failure. In the event of an overload, the device reports the fault condition to the processor to protect itself from damage.     High Performance The TPA3116D2 is a Class D amplifier IC from TI that has very high index parameters. Advanced oscillator / PLL circuit uses multiple switching frequency options to reject AM interference. The modulation frequency can be up to 1.2MHZ, and the high power output distortion is less than 0.1%. This helps prevent noise.     Application With bass, treble and volume control, easy to adjust volume, enjoy the music tone what you want. TDA3116D2 is widely used in store solicitation, home theater, square speakers, etc.due to its excellent performance and comprehensive cost performance.     High Quality It adopts copper DC connector and fence type terminal. It can withstand large current, no heat, no damage to the wire. Free DC head lead, compatible with the input power interface of this product, even if you dont have a DC head adapter or battery, it can be easily wired.          Product Name: 2.1-channel Bluetooth audio power amplifier module     Product model: zk-tb21     Bluetooth version: 5.0 (unobstructed, 10m)     Input sensitivity: 500mv     Input method: aux + Bluetooth     Number of channels: 2.1 channels     Power amplifier chip: tpa3116d2 (with am interference suppression function)     Adaptive power supply: above DC12 ~ 24V / 5A (the higher the voltage, the greater the output power)     Adaptive horn: 20 ~ 100W, 4 ~ 8     Output power: left and right channels less than equal 50W, subwoofer less than equal 100W     Protection mechanism: overvoltage, undervoltage, overheating, DC detection and short circuit protection     size:118x100x22MM     Material:PC+metal     colour:Black          Package Contents:     1 x bluetooth Amplifier board     1 x Screwdriver          Only the above package content, other products are not included.     Note: Light shooting 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.