"The JET 2-Ton, 115/230V Electric Trolley can lift up to a 4000-lb. load. Mounts to a variety of I-beams and wide flange beams. Works With Controller, Capacity lbs. 4,000. 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 7/32in.L x 13 5/8in.W x 12 3/4in.H"