Volumetric radio sensor with PIR. Bidirectional wireless transmission, advanced security RF protocol, transmission frequency 868.35 MHz, 868.85 MHz, ''contact open/closed'', ''tamper open/closed'' and ''supervision'' transmission, battery status indicated at each transmission, range up to 500m in open spaces, two-colour LED indicators for monitoring, pet immunity up to 15/25 kg (at 8 metres), unique identification code (ID), front and rear tamper, low energy consumption technology, power supply from single 3V lithium battery(in equipment). Dimensions (LxHxD) 123x62x38mm, weight 120g. COMPATIBLE ONLY WITH MODULE RADIO VEDORF, VEDO FULL RADIO, EASY SAFE FULL RADIO.