3 Key Single tone Door Bell IC, DING-DONG 1 time, DING-DONG 2 time
1 Key Siren Customized to modify the sound
Dual Tone Door Bell IC , 1.DING DONG 2.DING DING 3.WEST MINISTER
OSH,LH melody IC with 2 LED Flash, Customized to modify the melody
