R4-12.20 is an electric shock device for remotely opening left and right doors as well as double doors. It is made of zinc alloys and works with latch or ratchet locks. It can be used where a socket measuring 22 x 30 x 69 mm can be installed. The advantage of the lock lies in its compact dimensions and symmetry, allowing it to be mounted on both left and right doors, as well as its higher operational reliability, even with warped door frames or misaligned doors. The symmetrical design and small size enable its use in sliding gate systems. An attacker can operate with intercom and video intercom systems on all types of entrance doors. It features a latch lock function that allows the door to remain permanently open without requiring an electrical impulse.