Chipfox GPS tracker Really small GPS tracker with many functions.

Chipfox GPS tracker is small battery-operated, highly energy efficient device for tracking and securing of non-powered assets, animals or people. Communicates on Sigfox network. It doesn't need SIM card,  you don't have to recharge credit or battery, battery lasts for several years. Signal is resistant to jamming. Tracker features can be customized via web and mobile applications. 

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Ron - the IoT guy