... beep constantly("dee...dee..."),and push the button"A",LED on,keychain will stop beep after matching.Make ... LED off,Then turn on the 2nd keychain,and push button"B",keychain will stop beep after match,LED will ... do the same for the third,fourth,fifth keychain and button"C".Wear the 5 keychains on the ... lost keys,just push the corresponding button on the card,and the keychain will sound alarm within 1 ...