MVM - With Manual Override. Ideal for use on heavy duty gates, doors and cages, this electric rim lock from CDVI is available either with or without manual override. It meet IP53 standards with nylon gears and varnished electronics, making it suitable for use outdoors and it has a 2 Year manufacturer's guarantee. Supplied with a round cylinder and 2 keys, these locks emit an audible signal to alert users if there is a locking error. This unit has been designed with fixings which are compatible with other similar locking devices making it ideal for retrofitting purposes.. With or without manual override (MVA or MVM). Audible signal for lock error. Surface mounted. Nylon gears for a silent and rust free operation