Gradient Sequential Compression Pump w/ 4 Chamber Full Leg X-Large Sleeves Pair Complete Set. Made in U.S.A. FDA 510(k) Over the Counter Cleared & Registered / OVERLAPPING GARMENT / Quick & Easy to use Connector Gradient Squeezing Compression Mode System (Relief of muscle aches and pains, increase in circulation, simulates kneading and stroking of tissues...) Pressure: 20 ~ 100 mmHg / 60 min Timer & Continuous Mode / Cycle Time: Inflation: 36 seconds / Deflation: 24 seconds / 1st chamber 9 sec - 2nd chamber 7 sec - 1,2nd chamber 2 sec - 3rd chamber 7 sec - 1,2,3rd chamber 2 sec - 4th chamber 7 sec - 1,2,3,4th sec 2 sec - 24 sec deflation all 4 chambers repeat Certificate of Calibration + - 1% Accuracy F.S. / Cytotoxicity Test, Delayed Hypersensitivity / Animal Skin Irritation Test Pass (ISO 10993-, 10) / Electromagnetic Compatibility, Electric