Roller Shades

Clutch Chain Loop
Shade is raised and lowered by pulling on either side of a chain loop, which hangs on left or right of shade.
Spring Tension Roller
Shade is raised and lowered by gently tugging on shade pull to release/activate spring.
Motorized
Shade is powered by a motor which can be controlled by wall switch, remote control, sensor, timer, computer and/or other electronic devices.
Bottom-Up
Shade is operated with cords and spring-tension roller mounted at window bottom.