Two parameters?SPO2, Pulse Rate. Waveforms: No waveform. Features? 1?Tiny, light, "all-in-one" integrated clip design, easy for carrying; 2?LED screen with SpO2, PR and Pulse strength measurements; 3?Immediately, real-time spot-check; 4?Single button interface, easy for operation, 5?Common AAA alkaline or rechargeable batteries to support 3 continuous working hours; 6?Low battery power indicator; 7?Automatic power-off. H.S.Code: 90189090 Dimension: 67x38x36mm Net Weight: 60g