Wireless motion sensor alarm provides peace of mind! Easy-to-install unit senses motion up to 16.4 ft. away, alerting everyone of activity with a loud, piercing sound. Activates or deactivates with included key-fob remote controls; built-in entrance/exit delay feature prevents false alarms. Alarm unit (4-3/4" x 3-1/2" x 1-3/4" D) uses 4 AA batteries (not incl.); two key-fob remotes include batteries. Mounting hardware and instructions included.