Brand ALIGN Model DS425M Quantity 1 Piece(s)/pack Color Black Material Plastic Compatible device T-Rex 250 / 450 Functions Provides the power to control direction Other Feature Stall; Motion speed:0.07sec/60 degrees (4.8V) 0.05sec/60 degrees (6.0V); Rating voltage: DC 4.8~6.0V; Temperature range: -20'C~+60'C Packing List 1 x Digital Servo 2 x Servo rudders 3 x Screws