U-Prox WDC mini Magnetic Contact Detector - Brown SMART9406

Features : 

• One reed switch
• Operates up to 5 years with one CR2 battery
• Easy and convenient installation
• Zero interference with metal doors
• Efficient on metal doors
• Compact size
• Wide operating temperature range
• Available in three colors

Technical Specificatons :

• Power : 3V, CR2 lithium battery included
• Radio Frequency : ISM-band wireless interface, multi-speed
  with several channels
• ITU region 3 (AU): 916.5 to 917 MHz, bandwidth 100kHz, 20 mW max., up to 4800m (in line of sight)
• Communication : Secure two way communication,
  sabotage detection, key - 256 bits
• Operating temperature range : -20°C to +50°C
• Dimensions & weight : 85 х 18,5 х 17,6 mm & 56 gram
• Case colour : white, dark brown, black
• Magnet dimensions 85 х 11 х 6 mm
• Reed switch threshold 7-15 mm, operations > 1 000 000