iMeshbean 5 PCS 433MHZ Wireless Door Window Sensor for Wireless GSM Home Security Alarm System USA Operating Frequency: 433MHz ; Operating Voltage: 12V Launch Distance: 300 meters (open place);Encoding: Jump hat pin Size: 71 x 36 x 15(mm) / 2.8 x 1.4 x 0.6(inch ) Oscillation resistance jump cap options Power supply: Battery (12V DC included)