Smart Alarm SOS ButtonSmart Alarm SOS Button Raise an Alert Instantly Battery Powered (Supplied) 80 Meter Open Field RF Transmission (433Mhz) Requires Smart Alarm Hub (ECSPHB)Technical Specification:General Information: Material: ABSOperating Voltage: 1 x CR2025 3V BatteryMinimum Battery Life: 1 Year (dependant on activations)Device Input: 1 button – SOSDevice Communication: RF 433 MHz Transmission Distance: 80m (Open field)Dimensions: 3.4mm x 0.7mm x 6.3mmOperating Conditions: -10°C ~ 55°C