Weatherproof sealed case, digital circuitry. D-Tec™ Plus Sensing System (DTSS) with low battery drain. CNC machined Tru-Run™ roller wheel, twin multi-colour LEDs (Red, Green, Blue, Orange, Purple & White). On / Off toggle switch with 2 operational modes (day and night mode), when in night mode both LEDs will subtly glow in your chosen colour. High quality cone speaker with Indexed ergonomic control for volume (8 different levels of volume with lowest setting being completely silent). Indexed ergonomic control for tone (8 different tone settings: turn dial clockwise to raise pitch and anti-clockwise to lower pitch), indexed ergonomic control for Intelligent Sensitivity featuring See-Saw elimination (8 different sensitivity settings – see below Sensitivity table for comparison to NTX-R). Rigid 3/8” stainless steel thread and rod-friendly rubber inlays. Range test function allows user to check RX+ Receiver is picking up RX+ head at any given range, low battery warning (LED colour changes to cyan indicating it is time to replace batteries). Power out socket (2.5mm) for use with illuminated swingers. Supplied with two compression washer options: rigid and soft with an additional spare soft washer per unit.