Panasonic KX-TGA20B Accessory Key Detector
The Panasonic Key Detector can attach to your car key ring or other easily misplaced items and forget about ever losing them ever again. Using any of your compatible telephone handsets, you can activate the Key Detector's beeping alarm and quickly track down your lost keys. Key Detector's powerful range finds objects up to 600 feet away so you'll find whatever's lost whether it's upstairs, in your car or in the yard. You can register up to four Key Detectors and give each a distinctive name.