Feature: 1. Better Sound: With this audio amplifier board, you can enjoy better sound quality with low noise as well as low distortion. 2. Safe Working: The mono amp board with 5W output power also has short circuit current protection, very secure and reliable. 3. Wide Utility: Can be used for speaker, lever speaker, USB audio, video, power amplifier and other equipment, etc. 4. Simple Using: Comes with a mute switch, high level mute, low level play, and the default is low level play, simple to use. 5. Easy to Install: Designed to have a compact size and a light weight, the convenient installation can be quickly completed. Specification: Item Type: Audio Amplifier Board Product Specification: Approx. 20 x 16 x 8mm / 0.79 x 0.63 x 0.31in Output Power: 5W Power Supply: 5V, 1A Package List: 1 x Audio Amplifier Board Note: Positive and negative poles cannot be reversed.