A convenient way to add entry alerts to a home or a small business. Included is a wireless doorbell and a wireless window sensor. The doorbell button will trigger the doorbell to sound off one of 7 user selectable chime sounds. The window sensor, which is triggered by a reed switch, can be installed on a window (or door) and will trigger the chime when the window is closed or opened depending on how you choose to position the sensor. The doorbell can be left freestanding or mounted to a wall with the supplied mounting accessories. The doorbell button and window sensor can trigger different sounds so you know where entry has occurred. Overall, a totally wireless, hassle-free doorbell system.