Magnetic contact sensor with radio frequency (RF) transceiver, colour BROWN. Bidirectional wireless transmission, advanced security RF protocol, transmission frequency 868.35 MHz, 868.85 MHz, ''monitoring'', ''tamper open/closed'' and ''contact open/closed'' transmission, battery status indicated at each transmission, range up to 500 m in open spaces, unique identification code (ID), front and rear tamper, alarm activation by means of internal reed contact and/or wired contact, wired contact with 8.2k Ohm end-of-line resistor, low energy consumption technology, power supply from single 3V lithium battery(in equipment). Dimensions (LxHxD) 97x22x21mm, weight 40g. COMPATIBLE ONLY WITH MODULE RADIO VEDORF, VEDO FULL RADIO, EASY SAFE FULL RADIO.