The middle shell is made of aluminum alloy CNC processing, and the is anodized, which helps the motor heat dissipation, improves the strength of the servo shell, and has a stylish appearance. Multiple waterproof meet the application of different occasions, using ball bearings and metal gears, high precision, low noise, and smooth rotation. Built-in potentiometer (more than rotation life), accurate positioning. The main control IC uses advanced ASIC to process signals, with higher resolution, fast response time, large torque, and smooth rotation angle. Due to different batches, there may be differences in product appearance, color, and printed text, which not affect the use. Colour:Red Material:Aluminum Alloy Package Contents: 1 * Digital Servo Kit 1 * Parabolic Switch Kit 1 * Servo Arm Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.