Two-armed retractable ceiling-mounted pendant (YDT-DS) is an essential part of modern laminar flow operating room. This unit not only have high load capacity to carry other equipment but also provide space for numerous service outlets, e.g. medical gas, vucuum, electrical power and communication ports. Furthermore, configured with pneumatic braking and motor driver, so that can be rotated and lifted vertically without drifting. This pendant create a safer and more flexible environment for patients and staff.