vTreePro 2.0 Practice Tree Software for Windows features sound, user selectable background themes, optional external switches, and is packed with popular practice tree features. Use of vTreePro is an excellent tool for helping improve your reaction time. It is based on the 32-bit Windows XP programming environment. vTreePro's sound runs in the background at a lower priority as to not interfere with the timing accuracy. We have found that we cannot tell the difference in reaction times acquired in vTreePro when comparing them to those obtained with other practice tree tools. Two high quality stainless steel thumb switches are included, along with the V1P USB interface.