For those who regularly lose their keys — which is most of us — this keychain can make light work of finding those missing keys. This keychain works in two ways — when keys are lost, simply blow a whistle and the keychain will respond with a bright red flashing light and 8 beep sequences. If keys are in hand but light is scarce, use the flashing light to find a keyhole in the dark. Batteries are included. Measures 3" x 1 1/2".