The MIP3 system gives you the ability to link up to 16 devices together. Compatible with previous MIP System generations. A 3rd generation replacement or additional portable battery operated door chime unit Compatible with all MIP System generations. 32x High quality true sounds custom-made for the UK market which includes Big Ben Westminster chimes 6x tubular bells 5x ding dongs buzzers festive tunes sound effects and Stop Thief message. A huge 175m wireless unobstructed range. Chime dimensions: H6.0 x W9.0 cm approx.