Microsoft has announced several upcoming input devices, including a pair of new mice families that had previously been rumored. The company's BlueTrack Explorer mice, slated for a November release in $100 standard and $80 travel sizes, are the first to eschew common red LEDs for blue ones, purportedly increasing tracking ability on low-contrast surfaces. The wide-angle blue LEDs track a larger surface area than standard optical mice do, allowing them to function on uneven materials such as granite and unfinished wood. Working with existing mouse technology and arriving a month earlier in October, the $60 Arc Mouse, which showed up in pictures recently, is a laser-tracking, wireless model that unfolds from travel-sized to the length of a proper desktop mouse and features a tiny one-centimeter USB transceiver. Lastly, the new Wireless Laser Desktop 6000 and Wireless Optical Desktop 1000, coming out later this month, are incremental updates to the series, decreasing keyboard size by reducing unused space and re-engineering the keys to be thinner and quieter.