Industrial Passive Electronic Drawer Lock Cabinet Lock (by Bluetooth Key)

This is a smart lock, which can be widely used in many scenarios. The outer shell is made of very strong stainless steel, to ensure high level of security demand. 
PLEASE NOTE THE PRICES QUOTED DO NOT INCLUDE ANY COST OF THE BLUETOOTH KEY.
It applies screw thread M20 or M22 so that the old lock can be replaced without drilling new holes. The electronic cylinder gives brand new function. No elctrictiy or battery is needed for the lock. One electronic key (ONLY) with battery can manage as many locks as needed. (Yes, the housekeeper does not have to carry a bundle of keys.) 
Each key is securily encrypted. The key will be authorized to nominated lock(s).