Practical Bluetooth Compatible Stereo Amplifier ZK-302 DC Digital Stereo Power Amplifiers for DIYOOTDTY SpeakersFeatures: 100% Brand New and High Quality Made of high-quality fiberglass board and electronic components, practical and durable.5.1 bluetooth compatible version, DC 9-24V, transmission efficiency is higher, transmission distance is longer. Potentiometer to adjust the volume, through a switch, easy to control the volume, very suitable for speakers DIY.Do guests have at their disposal a DC head TV with cable, which is compatible with the input power interface of this product. Even if you don't have a DC head adapter or battery, you can connect it easily. This amplifier board has overheat protection, circuit protection, overvoltage and voltage protection. Specification: Material: Fiberglass Board + Electronic ComponentsSize: About 76x50x1 8mm/2.99x1.97x0.71 inchPackage Included: 1x 302 Digital Power Amplifier CardNote: 1. Please allow 1-3cm errors due to manual measurement, please make sure you do not mind before ordering. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item.