Magicfly® Locator objects (keys, wallets ...) with LED Keyring Whistler Key Finder Anti-Lost - 1 transmitter + 4 receivers (Electronics)
Everything is provided, ladhésif for items other than a bunch of keys, broken rings, button cells with the exception of the remote control batteries; if we did a little silence around us whistling is powerful enough to be heard 20 meters around good.