'Philco"is a state-of-the-art wireless alarm system for homes and businesses. It is user-friendly easy to use protecting homes/businesses at a minimum cost of investment. No installation required and self-monitoring alarm system without monthly fees is a key benefit for users. The system is motion sensored and alerts you with a piercing alarm for security or acts as a pleasant door chime for your home or business. Each measures 5" x 4 " Wall Mountable. Motion Sensor alarm and chime requires 1 9V Batteries each (not included)). Get piece of mind with our 2 in 1 affordable Motion Sensor Alarm and Chime. Great for doors, garages, sheds and more.