Total harmonic distortion: 380w (±65 power 4 ohm speaker, distortion <0.1%) 280w (±65 power 8 ohm speaker, distortion <0.1%) Frequency range: 20Hz-20kHz Speaker: 4-8ohm Voltage magnification: 36 times Input sensitivity 1.5v (RMS) Output short circuit protection: yes Output DC bias protection Speaker protection: yes Overheat protection: Yes, the temperature of the radiator is higher than 100°C, turn off the output! Product size: about 100×50×30mm / 3.93×1.96×1.18” Net weight: approx.100g