Roule&reg; RL-9830NRF Driveway Entryways Home and Office Infrared Alarm Motion Detect Sensor Detector Home Security Alert Alarm System Kit - 2 remote Controls Easy setup, comes with one infrared motion detect alarm, two key ring attached remote controls, mounting hardware. Infrared sensor working range: 20 feet. Remote control working range: 100 feet, with on/off buttons, comes with key ring and batteries. Alarm volume : 100dB , as loud as car horn. Most advanced energy saving circuit, 3 AAA batteries will last over 2 years, comes with low battery indicator.