Features:
* Internal thermostat triggers transmitter to send alarm signal when temperature falls to approximately 5oC (41oF)
* Frequency: 868.35, 433.92 or 418 MHz FM
* Power: 3.6 volts (half an AA lithium battery)
* Current: 25mA (transmission), 10μA (standby)
* RFI Immunity: 40 V/m
* Operating temperature: 0~60°C