Supports for Ascom and indi protocols. 5V power supply, only requires USB interface data cable to connect to the computer, wiring and power supply is simple. Specially customized 35 high torque stepper motor, which is more segmented than EAF's motor, with 3840 steps per turn, high segmentation, and more steps in the focusing area. Supports for Ascom and Indi. Automatic focusing can be achieved in for NINA, for MDL, for Sharpcap, or for kstars. If the aforementioned astronomical software is not required, there are also specially developed control software that can easily control the focusing device through a computer. About air travel (also known as backlash):Air travel is mainly generated by the mechanical structure of the focusing seat, and the air travel brought in by the focusing device itself can be ignored. Air travel exists as long as it is a mechanical device, and it only needs to be offset in the software, which does not represent the performance of the focusing device. Optical system: refractive type Main lens diameter: Less than 50m Color: Black Material: Plastic+Metal Specification:A: Fanxing electric focuser standard + special handle and temperature probe Package Contents: 1Set x Automatic Star Focuser With dedicated handle and temperature probe