The Proximo Proximity Monitoring System is reliable and very easy to use, but $60 is a high price to pay just to keep track of your belongings.
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Kensington's Proximo Proximity Monitoring System lets you tag and locate your items (including your iPhone) using Bluetooth and an iOS app.
The Proximo key fob sounds an alarm if you get too far from your iPhone and can help you find your keys. The system also feature GPS tracking.