The SPAL 37000149 converts any four-door vehicle with manual door locks to central locking power door locks.  

It comes complete with two 5-wire actuators, two 2-wire actuators, door lock module, wire harness and a complete set of accessories for installation into many vehicles. 

Switches are optional but not necessary because of the functionality of the central locking door lock module: when one of the lock switches is opened, the other locks open as well.