The 3rd generation in MIP System technology allows you to choose different sounds for different bell pushes and other transmitters with the flick of a switch so you can identify which door or room has been activated. Compatible with previous 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. The 3rd generation has a huge 200m wireless unobstructed range expandable further by using the MIP Signal Booster accessory. Easy DIY installation no wires no fuss.