... or lights or sound with light ,or flashing . A, sound keychain-sound module for promotion gift or entertainment 1,custom-made ... (sound,music,melody,housing color,housing size,shape,function,packageing)proceeding steps:a, sending me the sound file ... .e, printing your logo if you need . B, Light keychain(LED keychain) we can make any color LED( white,red,green,blue ...