List of products by brand Duobuy

Discover the FKGZJF Ring Sizing Kit—your ultimate solution to finding the perfect ring size effortlessly. Unlike unreliable string or paper methods, this precisely designed kit ensures a flawless fit exclusively for FKGZJF smart rings. Crafted with skin-friendly, high-quality materials, it offers a comfortable 24-hour wear test to determine your ideal size without discomfort. Suitable for men and women of all ages, it's perfect for the whole family. Plus, the FKGZJF Smart Ring boasts a powerful 3-5 day battery life on just a 2-hour charge, complemented by a portable 400mAh charging case that delivers up to 15 full charges—extending usage to 60 days. Easily charge your ring via magnetic USB or the case, compatible with Android 4.4+ and iOS 8.4+ devices. Your purchase includes the smart ring, charging case, dual charging cables, and instructions—a perfect gift for health-conscious men and women who value style and convenience.