FEATURES: New super compact design, 2.5 x 1 x 0.4 (HxWxD inches). Tamper supervised. Replaceable lithium PL2032 coin cell battery (supplied). 5-year battery life, typical. Magnet and Internal reed switch. External lead (24-inch mini connector pigtail) for wiring external devices (jumper-selectable). Magnet mounts with either supplied double-face tape or screws (screwcaps snap off mounting plate).