The R3-12.20L is an electric shocker designed for remote opening of left and double doors and gates. It is intended for doors and gates made of metal profiles and operates with bolt-bolt or ratchet locks. The reduction of the lock to the specified size is achieved through a lever system, allowing the bolts to fit into most door frames. It can work with intercom and video intercom systems in the entrance doors of single-family and multi-family homes. Made from corrosion-resistant materials, it can be installed outdoors. The R3-12.20L model features a latch lock function, allowing the door to be permanently opened without an electrical impulse when the latch lever is moved.