Brown wireless magnetic contact and inertial detector with Learn Mode technology. Monitored, minimum, each 17 minutes. 868Mhz (GEN2) Frequency. Outdoor range: 400m. Self-protection tamper. Fault or low battery indication. Power supply with high capacity lithium battery of 3VDC from 3 to 5 years of duration. Transmitter Dimensions: 114 x 32 x 32 mm, Magnet Dimensions: 12 x 39 x 13 mm. Security grade 2 certified. (60-942-8A Reference).