The Sigfox network
It serves to transfer very short data messages from COMET device to COMET cloud. The sigfox network works in a free radio band where data can't be sent faster than with a 10 min interval. The message is usually delivered within one second after the broadcast. Comet devices in the Sigfox transmission network can be used anywhere in the RC1 zone at no extra charge.
Sigfox network availability for Comet devices
If you are uncertain about coverage, please check before purchasing your device.