What are the options for tracking devices, that can be used with anything you want, like secretly hidden in your car, or in your wallet, or with all your keys?
PingGPS – Data plan included – GPS – Not available yet
Micro7 – £69 – Have to pay for coverage (6 months £99)
TrackR – $29 – Bluetooth and CrowdGPS network, 1yr battery life
Tile – Bluetooth (must be within 100feet), 4 for $70 (US)