The Danubia Motor Drive For the EQ-2 Mount For Delta 30 telescopes is fantastic for tracking the stars, whilst compensating for the earth's rotation. The drive can work for 24 hours using four C Type batteries (not included) in a seperate battery pack, which makes star gazing much easier and relaxed. There are two buttons, one for the northern hemisphere and one for the southern and when the light starts to flash, the batteries will work for another 8 hours before they need changing. Always remove the batteries from the power pack when the unit isn't in use.