The motorized electronic telescope focus device makes it possible to easily achieve focus. Use the push-button manual controller for smooth and precise focus adjustment without vibration. Using the adjustable speed controller, you can choose the speed from coarse to extreme. The DC motor is easy to install and can be used with for many , , and telescopes. The hand pointed at the telescope may cause the image to shake or even move out of of sight completely, especially at high magnification. But with electronic focus, these troubles have become a thing of the past. Using the push-button manual controller, you can focus smoothly and accurately without any vibration. It is powered by the 9-volt battery (NOT included) in the handheld controller. Also includes brackets, hardware and coil cables. Colour: black Material: metal Package Contents: 1 Set x Electronic telescope focus device Only the above package content, other products are not included. Note: Light 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.