The power supply is isolated industrial grade built-in power module with temperature protection, overcurrent and short circuit full protection. Features: AC85 - 264V or DC110 - 370V wide voltage input DC3.3V(+/ -1%) 1A isolated output Input Current: 0.5mA/115VAC 0.25mA/230VAC Input surge current: 10A (230VAC) Frequency range: 47-63Hz Operating Temperature: -30 - 70 ℃ Relative humidity: 20%- 90% Rated power: 3.5W Output efficiency: 61% Module size: 5.1*2.3*1.8cm