Logitech has announced their latest Bluetooth keyboard, the K810. This keyboard has been optimized for Windows 8, but it works with other Windows, iOS, and Android devices. The K810 has an aluminum body with a backlit keyboard with variable illumination and sensors that can detect when your hands are approaching and turn the lighting on. It can be paired with up to three devices simultaneously, and switching between them is as easy as pressing a key to make a selection. The internal battery is USB-chargeable, and you can even work while the keyboard charges. Logitech says you’ll get anywhere between 10 days to a year between charges, depending on how much you use it and how bright you use the illumination. The K810 Bluetooth keyboard will be available in the US beginning in October. It costs $99.99 and pre-ordering is available now. (Click the picture for a larger view.)