For stargazers, the phrase "as the world turns" means that celestial objects will drift out of your telescopes field of view - due to the Earths rotation. But with the Orion TD-1 Electronic 12V DC Tracking Drive for StarBlast 4.5 EQ, your target object will remain centered in the eyepiece for as long as you want to observe it. Compatible with the Orion StarBlast II 4.5 EQ Reflector, the TD-1 Electronic Drive installs quickly on the equatorial mount. The drives precision motor provides sidereal-rate tracking in right ascension, which is the rate that stars and deep-sky objects move across the sky. The included hand controller has forward and reverse slewing buttons at 2x and 4x speeds to facilitate centering objects in the telescopes eyepiece or moving to other, nearby objects. A simple thumbscrew "clutch" disengages the tracking motor from the right ascension gear, allowing use of the mounts manual slow-motion controls, when desired. A switch on the hand controller lets you set it for Northern or Southern hemisphere; it works in both. A convenient holding bracket for the hand controller is included and straps onto a tripod leg via a hook-and-loop band. Just set the controller in the holder when youre not using it. The TD-1 runs on eight 1.5V AA batteries (not included), which the user installs in the battery case provided. The Orion TD-1 Electronic 12V DC Tracking Drive is compatible with these telescopes: #9250 Orion StarBlast II 4.5 EQ Reflector #20711 Orion StarBlast II 4.5 EQ Reflector Kit Experience the convenience of hands-free, electronic object tracking with your Orion StarBlast II 4.5 EQ Reflector. Get the TD-1 Electronic 12V DC Tracking Drive today.