Bosch Wireless Reed, Radion, RFDW-SM

Dual Reed Switches: Unlike many contacts, this unit has a reed switch on both sides, allowing you to place the magnet on either the left or right side for maximum flexibility.

Detection Gap: The magnet must be mounted within 20 mm (0.78 in) of the device.

Tamper Protection: Includes both a cover tamper (if the lid is opened) and a wall tamper (if the unit is pulled off the frame).

Battery Life: Rated for up to 5 years. Because it uses a standard AAA Lithium battery, it is often easier and cheaper to maintain than sensors requiring specialized coin or photo cells.

Metal Surface Note: If mounting on a metal door, use a spacer (Part # BOSRFAC-DW-10) to prevent the metal from interfering with the magnet or the wireless range.