Add-a-Motor Motorized Drape Controller allows you to add motorization to existing drapery and vertical blinds. It can traverse 1-way in either direction, up to 8 feet on a sliding-carrier track or 10 feet on a wheel-carrier track, with a maximum fabric weight of 35 pounds. It can also traverse center-open, up to 10 feet on a sliding-carrier track or 12 feet on a wheel-carrier track, with the same maximum fabric weight. Additionally, it can rotate or traverse vertical blinds, or both rotate and traverse with two motors.