RC engine sound simulator, connect receiver, throttle and CH3 control. 10 built-in engine sounds and 5 built-in horn whistle sounds, which can be switched freely. Support 2S-4S Lipo. With intelligent Chinese and English voice prompts. With brake sound, brake sound can be set to open or close. Switchable sound corresponding to throttle forward or reverse. No operation within 60 seconds to enter the standby state, lightly push the throttle to start. Low voltage protection, automatic detection of battery type when booting. Fit for rc car, rc truck, rc motorcycle, rc boat, etc. Specifications: Item: RC engine sound simulator Input voltage: 6.5V-16.8V (2S-4S Lipo) Speaker power: 5W Compatibility: for rc car/rc truck/rc motorcycle, rc boat, etc. Shell material: Plastic Color: Black Type: Single channel Size: about 46*46*44mm Packing size: about 65*65*55mm Packing weight: about 113g / 163g Quantity: 1 set What's Included:no Battery 1 * RC Car Engine Sound Simulator(Single channel) 1 * Manual Note: Please make sure there is enough space to install it and use it within the proper voltage range. This is engine sound simulator for rc model car/motorcycle, not for real car. There may be some deviation due to manual measurement.