Gateman V20 Manual -

It includes a built-in 80dB alarm that triggers if the internal temperature reaches 60°C (fire detection) or if the lock is tampered with. Manual & Setup Review

Press [Reg] -> Press '3' for high, '2' for low, or '1' for mute -> Press [Reg]. Auto/Manual Mode gateman v20 manual

: The unit runs on 4 AA alkaline batteries. It is recommended to replace them every 6 months to prevent leakage. Emergency Access : If batteries fail, you can touch a 9V battery It includes a built-in 80dB alarm that triggers