Bidirectional magnetic contact. Frequency 868MHz. Radio range of 1600 meters in open space. 1 wired input. LED indicators for signal strength, battery status, alarm and tamper. -10 ° C ~ + 50 ° C operating temperature. Power supply: 1 CR123A 3V battery (estimated life of 2 years). 2mm ABS plastic shell. Transmitter dimensions: 104 x 27 x 25 mm. Magnet dimensions: 49 16 x 14 mm. EN50131 Grade 2 certificate.