The amplifier board features high power and high frequency, which has stable performance. Adopting class D intelligent chip, the amplifier board has pure and dynamic sound effect. Made of metal and plastic, the amplifier board is eco-friendly and to use. The length of the amplifier board is 11cm, width is 7cm and thickness is 3.5cm. The amplifier board is suitable for being used in speaker, radio and so on. Item Name: Amplifier Board Model: TPA3255 Working Method: Class D Standby Current: 80mA Work Efficiency:.more than the 90% Channel: 2.0 Quiet/Mute: Short-circuit Mute Function Output Power: 315W/4 ohm, Distortion 10% 185W/8 ohm, Distortion 10% 260W/4 ohm, Distortion 1% 150W/8 ohm, Distortion 1% Frequency Response: 20Hz to 20KHz Dynamic Range: more than the 100 dB Signal to Noise Ratio: more than the 111dB Working Voltage: DC24-40V Switching Power Supply(Recommended 36V) 2 Audio Operational Amplifiers: NE5532P Features: Intelligent Chip, Effect, Colour:As shown Material:pcb Package Contents: 3 * Amplifier Board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.