The QT645 PIR Power Interface is designed to connect to the slave input on a new-style QT602 or QT609 Master Call Point. Features Allows up to two QT638 PIR movement sensors to be connected to a Quantec addressable call system. Connects to the slave input on a QT602 or QT609 Range Call Point. Typically located outside a bedroom where, for example, two PIRs are being used to monitor a patient getting out of bed. Includes an isolation keyswitch so staff entering the room can temporarily disable the PIRs from triggering a call. Derives its power from the Quantec network (no need for a separate power supply unit) A maximum of 16 QT645s can be connected to a Quantec system. Mounts on a standard UK 25mm single gang flush or surface back box.