Honeywell RCHSPIR1/N Smarthome Indoor Motion Sensor

The Indoor Motion Sensor has long-range sensitivity and smart infrared that knows not to react to your pet - so you ony get alerted when you need to. With no wires or screws, it's easy to install and the battery lasts up to 3 years for low-maintenance awareness. 1) No wires, no screws - just an easy adhesive mounting for fast and simple installation. 2) Long-Range Sensitivity - Tamper-proof smart technology alerts you to motion from across the room within a 40 ft (12m) range. 3) Infrared motion detection with a battery that lasts up to 3 years means you rarely have to worry about changing the battery. 4) Ignores background motion like fans, robot vacuums, or pets up to 79 lbs (36 kg) so you only get alerted to what matters.