Interactive pen (pack includes 2 pens)</br>Projector Compatibility: W307USTi</br>90-Day Warranty</br></br>Product Description</br></br>Optoma SP.8UP06GC01 Interactive Pen (pack includes 2 pens). Projector Compatibility: W307USTi.</br><br/>http://www.amazon.com/gp/product/B00JM2ENH8