Team Associated ESS Dual Plus Engine Sound System for RC VehiclesOverview The Team Associated ESSDUAL+ Engine Sound System features two opposing speakers for balanced sound and better diffusion. This advanced sound system uses DNS DCR algorithm to reproduce realistic engine sounds. Key Features Dual opposing speakers 4 mounting holders Lightweight and compact Circuit overload thermal protection Supports 2 quick switching engine sounds AUX channel for additional sounds User customizable sounds Firmware updateable