Below you will find details about the Swann fob but it doesn't sound that great. I have been playing around with WiFi on phones, WiFi fobs in cars and they are all "ok" but not perfect. Last night I installed an Xbee3pro in my car with a micro python script installed on it to check in every 10secs and it reports back to a Xbee Presence sensors HE driver too and so far so good.
Also I had a friend in the US post me some Samsung Smartthings Arrival sensors as I hear they work pretty well. I think it cost me $98 AUD for two fobs and postage.
