Item No.: ST-89B

12 melodies choosing by button on right side of chime

70dB or 80dB of volume adjust by button on right side of chime

Work frequency 50-60MHz

Operating power requestion: 4pcs ‘AA’ alkaline batteries for chime

Item No.: ST-89D

12 melodies choosing by button on right side of chime

70dB or 80dB of volume adjust by button on right side of chime

Work frequency 50-60MHz

Operating power requestion: Directly to 110V or 220V main power