Magnetic contact sensor with radio frequency (RF) transceiver, colour WHITE. 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 500m 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) 97x22x21 mm, weight 40g. COMPATIBLE ONLY WITH MODULE RADIO VEDORF, VEDO FULL RADIO, EASY SAFE FULL RADIO.