High visibility 4mm multi-coloured LED (select between Red, Orange, Green and Blue) LED colour changed by pushing rubber touch button on rear of alarm (as per RX+) Indexed volume adjustment dial High quality Piezo speaker Rubber ear inlays Tru-Run roller wheel Two position toggle switch D-Tech Sensing System Silent start up 1 x power out socket for use with illuminated bite indicators Supplied with hard case Powered by 2 x AAA batteries