Features: 3P-cable (10cm long) on one side, plug-designed on the other side, portable and convenient to use. Generally, the steering gear is 180 degrees, but the remote control can only make 90 degrees rotate . The pwm output of the remote controller is: 1000-2000us; (At this time, the steering gear can rotate 90 degrees). This device extends it to 500-2500us, so as to rotate 180 degrees. Prerequisite: the steering gear can rotate 180 degrees within the range of 500-2500us. Application occasions: occasions where you want to extend the angle with the remote control, such as for robot arm, self-made sailboats. Specifications: Material: Plastic+Electronic Components Adaption-voltage: 3.6-16V(more than enough with high-voltage version of the servo/receiver) Functions: 180-degree steering gear supporting 500-2500us Plate Size: about 25x9mm/0.98x0.35" Package Includes: 1x 90 to 180 Degree Servo Expander note: Some steering gear meets the limit plate when it is less than 180 degrees. Do not operate hard to cause motor lock-up. Please note that this is an extension of the steering angle of the remote controller. It originally control 90 degrees, and is expanded to control 180 degrees. It is not directly changing the 90 degree steering gear into 180 degrees.