... ! pure sine wave inverter ModelsSY-L500SY ... sine wave (THD<3%)Frequency50/60Hz ±1% Selectable by DIP SwitchAC regulation±3%power factor allowed>0.99LED indecatorOVP,UVP,OTP,OLP,nput voltage ... sine wave, which is better than other modified sine wave and square wave.The main advantages includes: high quality sine AC ... power supply.Inverters can be used for areas without electricity, vehicles, ships, solar ...