Everyday Home 82-2355 Wireless Motion Sensor Alarm with Two Wireless Remotes Wall Mountable or Table Top Alarm Unit, Easy to Install, No Wiring Required Lightweight and Can Be Placed Virtually Anywhere, 105 dB Alert 110 Degree Range Projection, Includes Two Infrared Wireless Remotes with Keychain Infrared Technology, Alarm Unit Requires 4 AA Batteries (not included), Remote Requires 3 LR44 Batteries (included) Alarm Unit Dimensions: Length: 3.5", Width: 5", Height: 2", Remote Dimensions: Length: 1.25", Width: 2.25", Height: .5"