Tellus 4 Tellus 4 offers a sleek design and a fast Intel processor, lots of memory and a large hard disk. Tellus 4 with Windows 7 Pro and Mind Express opens the door to other software applications. One more step towards independency. The 13.3" capacitive touch screen displays a crisp and clear image suitable for indoor and outdoor use. The Tellus 4 has two built-in batteries. You can replace the one hot swappable battery without shutting down the device to lengthen the portability time.