Works with the Masimo 2219, 2220, 2221, 2222, 2696, 2697 probes for SpO2, SpCO, SpMet. Also works with 2501, 2502, 2507, 2508,2509,2510,2511,2512,2513,2514,2515,2516,2517 for SpO2 ONLY. All for LIFEPAK 15. Zoll Rainbow E and X Series. Also works with Matrix and Philips