Description: High bass two divided-frequency, full free welding, easy to operate. High bass with four gear adjustable, can be used for home audio or car audio. High bass allocation is more accurate, and bass is more powerful. Work mode: D class(PWM modulation) Operating Voltage: DC 2.5-5V Specification: Chip:OEP3W Material: PCB Output Power: 3W 4ohm/5V;1.8W 8ohm/5V; Frequency response:30Hz-20KHz Channel: mono Channel Quiescent Current:28mA/5V Noise ratio: 95dB Recommended Audio: 3-10W Output Impedance: 4-8ohm Harmonic distortion: Less than 0.1% Product Size: Approx. 45 x 28 x 28mm / 1.77x1.10x1.10inch Package Includes: 1 Piece of Digital Amplifier Module Note: Please allow 1-3mm differs due to manual measurement. Due to the different display and different light, the picture may not reflect the actual color of the item. Thanks for your understanding