Alera Adaptivergo Sit To Stand Perch Stool, Supports Up To 250 Lb, BlackGoes from sitting height to standing height; perfect for use with height adjustable workstations.Auto return swivel seat moves with the body as you twist, and returns to front automatically when you get up.Dual integrated height adjustment levers for quick adjustments with either hand. WARNING: This product can expose you to Di(2-ethylhexyl)phthalate (DEHP), which is known to the State of California to cause Cancer and Birth Defect/Reproductive Harm. For more information go to www.P65Warnings.ca.gov. - Cancer:Di(2-ethylhexyl)phthalate (DEHP);;Birth Defect/Reproductive Harm:Di(2-ethylhexyl)phthalate (DEHP)