Brand Name: ZWO Model Number:ZWO-EAF -HC This Hand Controller is designed for the ZWO Electronic Automatic Focuser. This Hand Controller links to the ZWO EAF (Electronic Automatic Focuser), it shows in every smooth inch of casing with APS material. It comes with a 3.5mm female socket. You will be having a comfort grip when you touch its ergonomic design! ZWO EAF Hand Controller provides an easy method of focusing the telescope, Featuring IN and OUT buttons, a 2-line display, slow and fast speed rate control.