This short 3-foot cable sensor is for use with an extension cable, and is compatible for the following SpO2 monitors: Novametrix: 505, 510, 511, 512, 513, 515B, 515C, 520, 520A, 7000, 7100, Oxypleth; Spacelabs: 90351-D/G, 90465, 90466, 90467, 90489, 90651-07/08, 90419-01, 90651A-07.