The PT Pen by Bald Technologies allows laptop users to make markups and annotations directly on their screens. A receiving station attached by a magnet to the top or side edge of the laptop connects to the computer via USB. Powered by a rechargeable lithium-polymer battery, the digital pen is compatible with PC and Mac laptops and works on screen sizes up to 16" with a 1,200-dpi resolution. • baldtechnologies.com