Universal transmitter and magnetic contact via supervised radio. EN-50131 Certificate Grade 2. SiWay Protocol. It works with 1 lithium battery of 3.6 V type 1 / 2AA. ID code 24 bits encrypted. Event transmission alarm, tamper, test, supervision and low battery. European frequency 868 MHz. Operating temperature: -10 to +50 ºC. Dimensions: 87 x 35 x 25 mm.