Collar Mount Realtime Waterproof GPS GSM GPRS Mini Pet Tracking Device Lightweight and Attractive: The curved design measures only 4 x 1.5 inches and fits nicely onto your pets collar. At only 1.5 ounces, its comfortable for almost any animal. A few minutes and a few pats later, and your pet will have forgotten its even there. Free App for Android and Apple: Download a free app for your iPhone or Android through your app store or at Electroflip.com, and read data from your PeTrack right on your smartphone. Motion Detection: The PeTrack uses an internal balance ball to determine motion, and enables location tracking upon sensing little Gizmos movement. After remaining still for more than 3 minutes, it powers down to save energy. While Gizmo sleeps, the PeTrack is conserving energy. Long Lasting Battery: The rechargeable lithium-polymer battery gives the PeTrack a full week of power with GPS enabled. In standby mode, it lasts 30 days. Just one charge a week (maybe during bath time) and the nagging concern of your pets safety is relieved. The PeTrack even reminds you when its getting low on power. Accurate GPS Technology: Track your pet to within 10 feet of its location with highly accurate uBlox GPS technology, leveraging 50 satellite channels. Even if Rex is on the run, you can stay right on top of him.