Works with Canadian SIM cards, GSM sim cards (Fido, Rodgers)

Super small size - 1 1/2 inch long, 1 inch wide.

Standbye time - 3-4 days

Simply call the number on the SIM card and listen to the device. Or, you can switch to a call back feature, then if the noise in the room exeeds 50 decibels, it calls your cell phone back. Just like an alarm.