FCC ID: G6D36U44A RADIO CONTROL TRIM CONTROL SWITCH: Trim switch is located on underside of vehicle. tis used to align the wheels of your vehicle for consistent drive in a straight line. Move switch left or right until desired alignment is reached. FOR BEST RESULTS: Be aware of radio frequency. Avoid operating within range of another unit using same frequency. Radio frequency is indicated on package, transmitter and vehicle. Use a New Bright 6 Volt rechargeable battery pack. Use fresh alkaline batteries.