SAFEPET4ME Waterproof Pet GPS Trackers, Black Waterproof, lightweight, small and sleek design Sms tracking (the SMS will include a website URL link, click on the link and it will take you to your device location on google map ) Free download app for android and IOS phones as well as free online real time tracking Standby: up to 200 hours Working based on existing GSM/GPRS network (ATandT, T-Mobile)