Specs

     RF frequency: 868MHz
     Power supply: 2 1.5V alkaline batteries
     Battery life of up to 3 years
     Power: 104dB at 1 meter
     -10 ° C ~ + 45 ° C operating temperature
     Relative humidity up to 85% (non-condensing)
     Dimensions: 179 (W) x 212.5 (H) x 53 mm
     Certified EN50131 Grade 2, ClassIV