Disclaimer: This guide is based on standard operational instructions for the Gateman V20/V10 series. Always refer to the physical manual supplied with your unit for specific, up-to-date instructions. If you'd like, I can: Help you find a .
While the door is locked, hold the Open/Close button for 5 seconds. This prevents anyone from opening the door from the outside, even with a valid PIN or card. 4. Maintenance and Battery Replacement The Gateman V20 uses 4 AA Alkaline batteries . gateman+v20+manual