mechanism keypad door lock for fence gate door 

mechanism keypad door lock
1.no batteries needed 
2.Change the code at will,easy change code  
3.open by code or mechanical key
4.waterproof panel, can use outside door 

2 ways to open lock: password code or mechanical key, even if you forget to take the key, password code can open lock, or if you forget password code, machanical key can open lock emergently