The Stairmaster 4400PT Stepper features an upright, rail-less design which encourages an improved exercise posture for the best lower-body workout of any stair climbing machine. This Stairmaster is the most space-efficient Stairclimber on the market (it fits in less than 2' x 4'/61 x 122 cm of floor space), and yet is extremely effective for a wide range of climbing exercise and conditioning needs. Patented, independent pedal geometry ensures safe, biomechanically-correct movement. The only difference between the Stairmaster 4400PT and 4400CL is the 4400CL is cordless, and the 4400PT plugs in.