Ergo Elements Adjustable Height Standing Desk with Manual Hand Crank Black Base, 5' x 30", Lava Stone Top This Set includes a Black Hand crank base and desk Top Height adjustment from 27" to 45" | length adjustment from 40" to 66" Controller: electric programmable controller with up & Down pushbuttons (mounts to bottom of tabletop). Desktops are designed with cutting edge materials, built with industry leading manufacturing processes, & constructed with 100% Recycled wood Content. Usa warranty & service: Ergo Elements is based in San Francisco, CA with full in-house customer service (m-f 9am-5pm pst). buy in Confidence.