Amazon has Magicfly Key Finder with 3 Receivers. Wireless RF Remote Item, Wallet Locator,Black for $22.99 with free shipping on order over $35.00
Works through walls and floors;
Long working distance,Transmitting Range:30~40 meters¡ê¡§open space¡ê?15-20 meters (indoors);
Loud sound:80~90Db;
Frequency: 433.92MHz, Housing material ABS;
Use to find keys, child, the aged people, wallet, purse, pets, dogs, and other items.
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