The function of ET600: 1. Multi opening ways 2. Electronic limit switches 3. Automatic safety reverse 4. 3 minutes light delay 5. Manual release in case of power failure 6. Chain drive, low noise 7. Soft start, soft stops 8. Backup battery function (optional) TECHNICAL DATA: INPUT VOLTAGE: 220/230V AC 50Hz (110v AC 60Hz or 127V AC 60Hz available on request) Single Phase Current Required 1Amp