Designed with official circuit standard. 15W+15W output with DC 12V power supply. Great heat dissipation performance, no extra cooling fin needed. Over temperature and over-current protection. With switch function. Type: Audio Amplifier Board Channel: D Class Stereo Power Supply Voltage: DC 12V Features: Dual Channel, Heat Dissipation Performance, Stereo Audio Amplifier, Mini Length: 30mm/1.18" (Approx.) Width: 24mm/0.94" (Approx.) Thickness: 1.5mm/0.06" (Approx.) Notes: Due to the light and screen setting difference, the color of item may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Audio Amplifier Board