. If you hear a melody or see a low-battery light, replace all four at once. Do not mix old and new batteries. Emergency Power : If the batteries die while you're outside, you can use a 9V battery
A multi-language user guide covering the V10 and V20 models can be found at BT Security . gateman+v20+manual
: You can toggle between automatic locking (the door locks as soon as it closes) and manual locking (you must touch the keypad to lock it) using the toggle switch located under the battery cover. gateman+v20+manual
When the batteries are low, the lock will play a melody (often "To Elise") after every operation. Replace all four batteries immediately. gateman+v20+manual