Enhance your presentation experience with this set of Dual Interactive Pens from Vivitek, compatible with the Vivitek D755WTi, D755WTIR, and DH758UST projectors. Write, draw, and touch on virtually any flat surface. Ultra-responsive infrared allows for fast and accurate response times. Two AAA batteries provide a long battery life of up to 27 hours of continuous usage. Both pens can be used simultaneously with the same projector.