Team Associated Sense Innovations ESS-Dual+ Engine Sound Simulator SystemHas two opposing speakers for balanced sound and better diffusion. Four mounting holders make it easier to install on a variety of vehicles. Lightweight and compact in size, easy to install. Output is circuit, overload, and thermally protected. Features: Uses advanced DNS DCR algorithm to reproduce the sound of real engines Supports two sets of quick switching engine sounds Supports AUX channel that can simulate a variety of sounds such as alarm