Zehui Credit Card Size Wireless Key Finder Remote Key Locator Extended Range 40M Transmitter card size: 8.4*5.5*0.4cm Receiver size: 5.8*3.4*1.4cm 40 Meters(120 Feet) Rf Detection Range Works Through Walls And Floors(Great Ability To Find Your Keys Even If Hidden Inside Drawers, Cabinets, Pockets, And Any Other Hard To Find Place), Finds Lost Keys Quickly Long Lasting Battery (1 Year For Transmitter Battery Cr2016, Over 6 Months For Receiver Battery Cr2032, Batteries Are Easily To Be Replaced After Use Up) Credit Card Shaped Transmitter Fits In Any Wallet Or Purse