Wireless entrance alert chime. Chimes when someone opens a door or window. Features distinct sounds for open and closed. Kit includes a wireless door/window transmitter and a wireless chime receiver. Transmitter activates when the door or window is opened, sends a wireless signal to the receiver and sends another signal when the door or window is closed. Ideal for small businesses, stores, workshops, and churches. Features self-programming to ensure no interaction from neighboring systems. (3) C alkaline batteries required for receiver, not included. (1) CR2032 lithium battery included for the door/window transmitter. 3.25 inches wide x 4.5 inches high x 1.75 inches deep. Weighs 0.44 pounds. 2 year warranty.