brand new and high quality Features: Bluetooth-compatible must be connected to be in Bluetooth-compatible mode, otherwise it is AUX. Made of high quality materials, featuring high performance and high performance price, especially for HIFI music power amplifier with high power and for high fidelity. 5.0 Bluetooth-compatible version has higher transmission efficiency, and longer transmission distance. TPA3116D2 is a D type amplifier IC, which has very high frequency of up to 1.2MHZ, and the output distortion is less than 0.1%. The red and gray ring inductors are specially designed for digital power amplifiers, while the 684 film capacitor is a special capacitor for audio amplifier, so both of them are features low loss, high bandwidth and for high fidelity. With AUX and Bluetooth-compatible two audio source input mode, two in one. With a switch, potentiometer can be used to adjust the volume, easy to control the volume, very suitable for DIY speakers. Copper for DC female for head, fence terminal, withstand large current, no heat, no damage to the line, good wiring, not easy to short circuit. Specification: Material: Fiber glass board + Electronic component Size: app.84 x 54 x 24mm/3.31 x 2.13 x 0.94in Color: As picture shown Quantity: 1 Pc Parameter: Model: ZK-1002 Bluetooth-compatible Version: 5.0 Chip Solution: TPA3116D2 (With AM interference suppression) With or Without Filter: Yes (Filtered sound is more round and clear) Adaption Supply Voltage: 5-27V (Optional 9V/12V/11/18V/24V adapter, high power recommended high voltage) Adapter Speaker: 50W-300W, 4-8 Number of Channels: Left and right stereo (Stereo) Bluetooth-compatible Transmission Distance: 15m(Without occlusion) for Protection Mechanism: Overvoltage, Undervoltage, Overheating, for DC detection, Short Circuit for protection Tip: To have enough output power if the audio input is sufficient and the supply voltage/current is sufficient. The power supply voltage is higher and the relative power will be larger. The speakers with different impedances will have different output power. In the for case of sufficient voltage and current, the larger the ohms of the horn the smaller the relative sound power. Please pay attention! Power Supply Voltage: 12V-8hom speaker/24W (Left channel) + 24W (Right channel), 4 ohm speaker/40W + 40W 15V-8homs /36W + 36W, 4 ohm/greater than 60W + 60W 19V-8homs /64W + 64W, 4 ohm/greater than 90W + 90W 24V-8homs /76W + 76W, 4 ohm/greater than 110W + 110W Note: No retail package. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 x Bluetooth-compatible Amplifier Board