Smart ring magnetic charging adapter universal type-c female to Bluetooth ring strong magnetic charging smart ring charging Specification: Product size: 17*10*4.4mm Applicable ring inner diameter size: 17.4 to 22.3mm 1. Compatible with all types of smart rings for plug-and-play charging and portable operation. 2. Powerful N52 magnets ensure high portability. Built-in magnets automatically snap your watch into place, ensuring good contact and reducing wear on the connector. 3. Highly efficient and safe with built-in intelligent short-circuit protection. 4. Built-in blue indicator light ensures clear viewing even at night. 5. Ultra-compact size: 17*10*4.4mm, making it easy to store. Product list:one size(gray blue/silver/purple)