VStarcam AF117 433mhz Frequency Door Window Sensor Detector for Vstarcam C37-AR IP Camera Price: US $4.64 Free Shipping Buy Now Specification : Model: AF117 Technical Parameters: Working Voltage: DC12V Working current:10MA Wireless frequency: 433MHZ Transmission Distance: Open area 120m Size: 81 x 40 x 15mm Package includeds : 1 x VStarcam AF117 Door Window Sensor Buy Now