Left Turn Alarm - Basic

The RA-MF097WLT is a reversing alarm that is designed to alert pedestrians and other drivers of your vehicle's presence. It features a dual-voltage power supply (12/24V), a specialist left turn talking alarm, and white noise for added safety. The alarm is also wire-fixed for easy installation. Dimensions: 103 (L) x 44 (W) x 67mm (H).  It is 97 decibels.

This left turn alarm can be used to make a HGV DVS compliant. This left turn alarm has 4 wires so you can link it to the right indicator as well. If it detects both left and right signals at once, then it realizes that the hazard lights are on and will not make any noise.