"The JET 1/2-Ton, 115/230V Electric Trolley can lift up to a 1000-lb. load. Mounts to a variety of I-beams and wide flange beams. Capacity lbs. 1,000, Works With Controller. Designed to give single control convenience Features 115/230V, 1 phase wiring specify voltage when ordering Solenoid operated traveling brake Adjustable to fit various size I-beams and wide flange beams Must be fitted with a JET 4 station 24V push-button control sold separately Durable powder-coat finish Lug mount or hook pin Electronic trolley not supplied with a 4-button controller 21 1/2in.L x 14 1/8in.W x 12 7/8in.H"