I4U has posted a RFideas pcProx Sonar Presence USB Sensor review

The RFideas pcProx is a proximity zone detector that sends different keystrokes for walk-away and walk-up conditions. The idea is to automatically lock a PC when the user is walking away. If you have a sneaky room-mate or do not want your boss to see that you spent time again on britneyspears.com by forgetting to log-off when leaving your PC, the pcProx Sonar is your solution.

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