... service, sound custom-made ,press a button ,it sounds or lights or sound with light ,or flashing . A, sound keychain-sound ... gift or entertainment 1,custom-made (sound,music,melody,housing color,housing size,shape,function,packageing)proceeding steps:a, sending me ... logo if you need . B, Light keychain(LED keychain) we can make any color LED( white,red,green,blue,RGB light ,etc.) C ...