Battery-operated electromechanical lock is an autonomous, radio-controlled invisible lock that can be installed on any doors or safes secretly. The lock is controlled by the remote control. The absence of a keyhole outside the door makes it impossible to open the lock with master keys and deliberately clogging the key hole with matches or glue (a unique anti-tamper function). The main field of application is installation in metal, wooden doors of apartments, cottages, offices. A hidden lock can also be installed on the door of cabinets, safes, industrial and household refrigerators. The lock can be installed anywhere in the door and even where it is inconvenient to use a conventional lock. Complete with a lock is a standard mechanically lockable "larva" complete with five keys. Using the ULTRA STEALTH LOCK, you can securely lock any door within 10 minutes. An indisputable advantage of autonomous power supply is that the lock is not connected to the mains by wires, which spoil the interior of the hallway with their appearance, but are powered by four ordinary AA batteries. Lack of connection to the mains eliminates the possibility of a short circuit (fire) or damage to the castle by a criminal using a stun gun. When installing special lithium batteries, the lock remains operational up to -35. Also in the catalog there is an invisible mortise lock, which is installed covertly in the door or in the safes. It runs on built-in batteries for about 2 years without recharging.