Paradox Ultra-Small Door Contact

One high-sensitivity reed switch (magnet included)
Wireless range in a typical residential environment: - 20m (65ft) with MG6160 and MG6130; - 40m (130ft) with MG5000, MG5050 and RTX3
Anti-tamper switch
Dimensions: 4.4cm x 3.0cm x 1.7cm (1.7in x 1.2in x 0.7in)