Lost keys,remote, cellular, wallet, etc.
Being rechargeable it may be worth a look https://www.frys.com/product/9177958;jsessionid=T78ws-cTpmaC3E3FS4FUIw__.node2?site=sr:SEARCH:MAIN_RSLT_PG
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No need for GPS, it only has a 75 foot transmit radius.
