Features: Adopts power amplifier chip TDA7498E, with high-fidelity stereo sound. 2.1-Channel left channel right channel subwoofer, 160Wx 2+220W output power. Features anti-reverse connection, undervoltage, overheating, overcurrent, short circuit for protection, safe to use. BT 5.0 version, long-life ultra-quiet fan, helps to reduce the temperature of the module and ensure its long-term stable operation. Dial-wheel button, easy to operate, with its excellent performance and comprehensive cost performance, it is widely used in home theater, KTV, stage speakers, etc. Specifications: Product Name: 2.1-Channel Bluetooth-compatible Audio Amplifier Moudle Model: ZK-HT21 BLE Version: BT 5.0 Wireless Distance: about 15m(unobstructed) Amplifier Chip: TDA7498E Channel: 2.1-channel (Left Channel Right Channel Subwoofer) Supply Voltage: DC15-36V, Support 9V under-voltage for protection, can also support 12V power supply Speaker Adaptive Power Supply: 30-200W, 4-8Ω Output Speaker: Left Right Channel ≤160W, Subwoofer ≤220W Protection: Anti-reverse, undervoltage, overheating, short circuit for protection Material: Metal, Printed Circuit Board Size: Approx. 145x126x28 mm/5.70x4.96x1.10 inch Package Includes: 1 Piece Power Amplifier Board Module note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!