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Tracker name | Maker | Size | Known cost (hardware only) | Tracking method | Communication method | Notes |
|---|---|---|---|---|---|---|
MIT Tracker I | MIT CSAIL | 2"x4"x.5" | ? | Cell-tower triangulation | SMS | No longer in production |
MIT Tracker II | MIT CSAIL | 1"x3"x.25" | ? | Cell-tower triangulation | SMS | No longer in production |
Qualcomm Tracker | Qualcomm | 1.5"x2.5"x.5" | 150 USD | GPS | GPRS over CDMA | No longer in production |
Tagg Pet Tracker | Snaptracs / Qualcomm | 1.5 x 3.2 x 0.8 inches ; 1.1 ounces | ~100 USD | GPS / wireless | mobile phone network |