TX Juice EAZI Copter - World's First R/C Helicopter with Altitude Stabilization - Toys for children and adults ENTRY PRICE, BUT NOT ENTRY QUALITY - Metal & ABS construction for optimum strength UNIQUE JUICE BUTTON ACTIVATES HEIGHT (ALTITUDE) STABILISATION = One thumb control for ease of use EASY TO FLY, FUN TO PERFECT - After take off finesse the throttle to steady the height & then hit the Juice button to lock in your desired altitude Batteries 4 x AA batteries required.