The Yale Security Easy Fit Standard Alarm is a basic keypad operated system which is ideal for a flat, or terraced or semi-detached homes. The keypad enables setting or unsetting of the alarm via an access code. The system is pre-set with a 20 second exit/entry period and will allow the entire property to be either armed or disarmed. The kit is pre-linked for easy programming and features advanced jamming detection. It has an extra secure rolling code transmission and can be expanded to include 30 devices. This set includes the following: 1 x Siren box.2 x PIR movement detectors.2 x Door contacts.1 x Keypad. All batteries included. Easy Fit Standard Alarm Kit