1, 35 songs selectable 2, Volume control 3, Range more than 100 meters 2 4 ... receiver2) Anti interference technology used. (digital coding)3) 35 different musics can be chosen by using Up and ... Down switch, make you enjoy.4) 3 segment volume selection.5) Easy instillation, no wiring ... can be chosen: Silver, blue, purple, green, yellow. 35 songs selectable: 1, Ding Dong,Ding Dong2, Dest Minister3, ...