For those who... want an extra level of security.
The tracking device is powered by Chipolo Technology. It is compatible with iOS9/Android 4.4 and above and can be used worldwide. The Tracking Card is solar-powered. 3 hours of charging can last up to 2-3 full months. You can use the ringer, from your app (phone) or your Tracking Card to locate the other. Please note that in order to locate the Tracking Card, your app (phone) must be within a 200 ft (60 m) radius.
Details:
Size: .15 x 2.7 x 3.9 in / .4 x 7 x 10cm
Layout includes: solar-panel, ringer button and QR safety net