The JAKCOM R4 smart ring features NFC functionality and a stylish design, making it perfect for everyday use. - Brand: JAKCOM - Model: R4 - Size: No.11 65mm / 2.6 in - Accessories: Instruction manual - Features: NFC function Purchased in March 2024, but it has been stored unused because the size didn't fit. Although it has not been used, it has been opened. For those who don't mind this and can understand the instructions (QR code is also included). Thank you for your interest.