1, 35 songs selectable 2, Volume control 3, Range more ... on receiver2) Anti interference technology used. (digital coding)3) 35 different musics can be chosen by using Up and Down ... colours can be chosen: Silver, blue, purple, green, yellow. 35 songs selectable: 1, Ding Dong,Ding Dong2, Dest Minister3, Ding ... 23, My heart will go on24-26, Russian Music27-35, Arabia Music 35 Music AC Wireless Doorbell