Description: 100% Brand New and High Quality! Specifications: Power Supply: 2.1 interface 8~24V DC Output Impedance:4,6,8,16 ohm impedance can drive, but 8 ohms is the best. Bluetooth version: 4.0 Color:(As The Picture Shows) Audio Output: Terminals Output Power: Add Pre?5532 Output Foot Size: Approx.8.2*5cm Original Box:No Note: If you use external audio, you need use a 3.5mm audio line to connect. If you use Bluetooth directly, when power on, you have to wait 3 to 10 seconds, until LED blue and red light flashing alternately. Then you can use your device to find the Bluetooth module and connect it. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. Attention: Size may be slight inaccuracy due to different batches of the products, or hand measurement;Color may be little different due to monitors. Please take real product as standard, thanks for your understanding! Package Includes: 1 * TDA7492P CSR8635 2x50W Amplifier Board 1、Precise incisions and interfaces make sure perfect fit, suitable for mounting position and easy to install. 2、The product uses high quality materials, effectively avoid corrosion and wear out, and durable. 3、Professional chip set provides superior performance in the system. 4、Easy to operate, anti?aging, and extended service life. 5、The DIP switch makes it easier to directly adjust the gain of the post amplifier, better promotes greater damping of the speaker.