Feature: 1. With excellent manufacturing technology, it is not easy to have false welding 2. With overvoltage protection, undervoltage protection, overheating protection and short circuit protection, the performance is stable 3. Multiple input modes to meet the needs of various working scenarios. For your convenience 4. Applicable to sound engineering, electronic equipment, industrial engineering, etc 5. Used to amplify audio signal, left and right dual channels, stereo mode. Suitable for 15 to 100W; 4 Ω to 8 Ω Specification: Item Type: Power Amplifier Module Material: PCB Model: ZK502MT Power: 2 x 50W Sound Source Input: BT , AUX Adaptive Power Supply: DC 9 to 24V Adaptive Horn: 15 to 100W; 4Ω to 8Ω Number of Channels: Left and Right Dual Channels (Stereo) BT Version: 5.0 (> Approx. 15m / 16yd, Unobstructed) Purpose: Amplify Audio Signal to Drive Speaker Applicable Scene: Industrial Engineering, Sound Engineering Power Supply Voltage: 12V: 8Ω / 12W + 12W, 4Ω / 20W + 20W 15V :8Ω / 18W + 18W, 4Ω / 30W + 30W 19V :8Ω / 30W + 30W, 4Ω / 40W + 40W 24V :8Ω / 40W + 40W, 4 Ω / 50W + 50W. Package List: 1 x Amplifier Module1 x Screwdriver3 x Knob Hat1 x Radiating Plate1 x Power Head 9 x Screw 8 x Copper Column2 x Acrylic Board Note: 1. If the audio input is sufficient, there will be sufficient output power without sufficient power supply / current. The relative power of the power supply voltage will be large, and the speakers of different impedances have different output powers. In the case of sufficient voltage current, the larger the number of speakers, the smaller the relative sound power.2. Please allow 0 to 2 cm error due to manual measurement. Thanks for your understanding.