|Size||3.7 x 6.8 x 0.2 cm (1.5 x 2.7 x 0.1 in)|
|Battery Life||1 year|
I think it would be moderately useful in finding a lost item. It would take some guessing out of where exactly you dropped something, as long as it was a stationary place. If your wallet fell out in a bus or taxi, man, good luck.