Specification: Origin: Mainland China Working voltage: DC: 5~24V Bluetooth-compatible version: 5.0 Transmission distance: 15 meters (visible without obstruction) Number of channels: Two channels (stereo) Output power (@1KHz): 20W*2 @12V 4Ω 30W*2 @16V 4Ω 30W*2 @21V 8Ω 40W*2 @24V 8Ω Compatible speaker (40W~200W): 4 ohm (5~16V power supply) 8 ohms (5~24V power supply) Module protection mechanism: power reverse connection protection Short circuit protection Self-restoring overheating protection Product size: 55.00x38.00x12.00mm/2.17x1.5x0.47inch Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation due to manual measurement. Included: 1 x Dual-Channel Amplifier Board Satisfaction Guarantee: We strive to provide each customer with the highest standard of customer service to ensure you have a pleasant shopping experience. If you have any issues, inquiries or need assistance, please feel free to contact us directly. Versatile Compatibility: The XY-P40W amplifier board is compatible with a wide range of audio devices, including smartphones, tablets, computers, and more. It can be easily integrated into existing audio setups, providing enhanced sound performance and versatility. Compact and Portable: The audio power amplifier board is designed to be compact and portable, making it easy to carry and install. Suitable for various scenarios, such as home entertainment, outdoor activities, and car audio systems. High-Quality Audio: It features low noise and low distortion, preserving the original quality of the audio signal, allowing users to enjoy high-quality music and sound. Stereo Output: The XY-P40W amplifier board supports stereo output, providing independent amplification and processing for the left and right channels. And utilizes high-quality audio processing technology, delivering clear and transparent audio output.