With this wireless door entry chime sensor, you will never miss anyone at the door. Now you can go do what's important in the back or upstairs without worrying if someone stopped by. The wireless and portable design allow you to install the entrance alert chime in any section of your home, office or business shop. This entry chime kit can be used as a wireless shop bell or shop entry door chime, home entrance chime or burglar entry alert for home and business. Package includes: 3 x Magnetic Sensor 3 x Magnetic Stick 3 x Remote Control 3 x User Manual.