Specifications:1. Power supply: dual DC power supply 58- 70V2. The rated output power: 500W ( 65V power supply, 4 ohm load, distortion 10%)3. Efficiency:> = 90%4. SNR: 90dB5. The total harmonic distortion: 380W ( 65 power 4 ohm speaker, distortion 280W ( 65 power 8 ohm speaker, distortion 6. Frequency range: 20Hz-20KHz7. Speaker: 4-8ohm8. Voltage Magnification: 36 times9. Input sensitivity 1.5V (RMS)10. Output short circuit protection: Yes11. That output DC bias protection speaker protection: Yes12. Over-temperature protection: Yes, radiator FET temperature higher than 100 C, turn off the output13. Product Size: approx. 100*50*30mm3.93*1.96*1.18'14. Net weight: approx.100gIncluded:1 x Digital Amplifier ModuleNote: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.