This is not a lock in itself, but is powered by a euro cylinder lock. A multi-point locking mechanism is a line of bolts down the edge of a door that extend into the frame when the key is turned to lock it. This mechanism is often found on uPVC and composite doors, and on patio and French doors.
If your door is older than 5 years, then your multi-point locking mechanism is probably no longer manufactured. There have been major advances in this technology, and our locksmiths are able to fit a Universal Yale Multi-Locking System to most doors.