Attention: We are specifically designed for people with super large arms. If your upper arm circumference is less than 40cm, it will be too large for you. Please purchase with caution. Size:The extra large blood pressure cuff is suitable for people with big arm circumferences of 40-66cm(15.75-26 inch). Universal Compatibility:6 different types of connectors(4mm/0.16in, 4.6mm/0.18in, 5mm/0.2in, 6mm/0.24in, 7mm/0.28in, 11.3mm/0.445) are compatible with almost all blood pressure monitors. Comfortable Fit: Ergonomically designed, the bp cuff is made of soft, breathable materials to ensure comfortable wear. Durable: Crafted with high-quality materials and exquisite workmanship, the cuff ensures outstanding durability, offering you long-term reliability.