Ultra Thin Card GPS Tracker | Bank Card Size | Wallet Bag Anti-Lost Bluetooth Locator | Real Time TrackingOverview This card sized GPS tracker is one of the more practical anti loss gadgets I've come across. It's literally the same size and thickness as a bank card, so it slides into a wallet, passport holder, laptop bag or luggage pocket without adding any bulk. The map view on the app shows location clearly and the real time tracking response is actually decent for a device this small. I was skeptical it would fit in a slim wallet but it genuinely does.