The houselink receiver will make life easier for you by monitoring all sensors and their battery life. You no longer have to keep checking the batteries yourself. Works with up to 4 sensors. (sensors sold separately). It has both audio and visual indicators, alerting you with a light or a beeping sound. Works within an operating range of 300 feet.

• Works with up to 4 sensors.
  (sensors sold separately).
• Monitors the sensors and their battery condition automatically.
• Both audio and visual indicators.
• Operating range: 300 feet.
• AC adapter included.
• Easy to set up.
• FCC/IC approved.
• One year warranty