Ring alarm system 2nd generation. Included Components The standard 5-piece starter kit comes with: Base Station: The main brain of the system that sounds a 104-decibel siren. Keypad: Used to arm Contact Sensor: Attaches to a door or window to detect when it opens. Motion Detector: Senses movement inside a room. Range Extender: Plugs into a wall to boost the wireless signal to distant sensors.