Features: brand new and high quality Dual channel output. Using advanced SGS(sound particle synthesis technology), for SFC(intelligent state follow compensation technology), more true sound. AUX channel support, can simulate a variety of auxiliary sound. It can simulate all types of alarm horn sounds. The device supports up to 4S lipo. Supports up to 10 built-in engine sounds and 5 built-in alarm sounds. It can be switched freely between different engines. Support the sound of the shutdown exhaust valves. The brake sound can be adjusted freely on and off. Throttle steering support positive and negative settings. Support standby state, enter standby when the remote control is not operated within 60 seconds. Tap the accelerator gently to start. Low voltage for protection support, automatically detect the type of battery when connecting.(Battery is not included.) Support intelligent English and Chinese voice prompts, so that the operation becomes easy and free. Specification: Color: Black Material: ABS Size: app. 46x82x46mm(1.81x3.23x1.81in) Quantity: 1 set Note: Transition: 1cm=10mm=0.39inch No retail package. Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package includes: 1 x Engine Simulated Speaker 1 x Cable Set 1 x Manual (other accessories demo in the picture is not included.)