Shop name:Chong Qing Shuo Yue Ke Ji You Xian Gong Si [High Quality] It adopts copper DC connector and fence type terminal. It can withstand current, no heat, no damage to the wire. Free DC head lead, with the input interface of this product, even if you dont have a DC head adapter or battery, it can be easily wired. [HIFI Stereo] High quality dual channel 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. [High Performance] Class D amplifier IC from has very high index parameters. Advanced oscillator / PLL circuit uses multiple switching frequency to reject AM interference. The modulation frequency can be up to 1.2MHZ, and the high output distortion is less than 0.1%. This helps prevent noise. [Protection Mechanism] devices feature short-circuit and thermal protection as as overvoltage, undervoltage, and DC protection to prevent failure. In the event of an overload, the device reports the fault condition to the processor to itself from damage. [Application] The potentiometer adjusts the volume with a switch for easy control of the volume, making it perfect for DIY speakers. widely used in store solicitation, home theater, speakers, etc.due to performance and comprehensive cost performance. Number of channels: left and right dual channels (stereo) : xy-c50l Adaptive horn: 0W ~ 200W 4 ohm 8 ohm 16 ohm supply voltage: DC: 5 ~ 24 V (the higher the voltage, the greater the output ) Transmission distance: 15m (without shielding) Protection mechanism: reverse connection protection, short circuit protection, recovery overheat protection Colour: black Material:metal + PCB Size: 56x50x18MM Package Contents: 1 * Amplifier Board Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.