Features: 1. Through the NFC radio frequency communication technology and mobile phone connection to the mobile phone function operation and sharing of data. 2. No charge / depth waterproof, built-in ultra-sensitive NFC chip, no electricity to work, easy to wear. 3. Multi-functional NFC smart ring, the main function is to store and exchange personal information, as well as mobile content and personal privacy encryption unlock. 4. Lock / unlock the program, select the application you want to lock / unlock, write the smart ring, only the ring touch the phone to start the application, to protect personal privacy. 5. Beautiful appearance, easy to use. Specification: Material: Metal Size: about 4*5*0.5cm/1.57*1.97*0.2in Product Name: NFC Multi-function Smart Ring Size: 6/7/8/9/10/11/12/13 inch Package List: 1 * Smart Ring 1 * Instruction Manual Instructions for use: 1. First, check if your smartphone has NFC function. It can usually be found in the system settings. If no relevant options are found, contact with the manufacturer post-sale support, or search on Google if the smartphone model has NFC function and confirm its NFC area. 2. If your smartphone has NFC function, turn on the NFC switch, search your app for the software which apply NFC, download and install them. 3. Start the NFC APP, perform actions according to the instructions. 4. Since NFC is a near field communication technology, make sure to place the top side of the ring chip right close to the NFC area when reading any data to avoid the failure in reading and writing. 100% Warranty?We promises every customer a 100% shopping satisfaction, feel free to reach us if you have any questions about your purchase. We will give you a professional and detailed reply within 24 hours during the working day. Click to buy now!. Easy to Use?Lock / unlock the program, select the application you want to lock / unlock, write the smart ring, only the ring touch the phone to start the application, to protect personal privacy. High Quality & Durable?Beautiful appearance, 6/7/8/9/10/11/12/13 inch size to choose, perfect for women men kids boys girls, easy to use. No charge / depth waterproof, built-in ultra-sensitive NFC chip, no electricity to work, easy to wear. Wearable Smart Ring?Multi-functional NFC smart ring, the main function is to store and exchange personal information, as well as mobile content and personal privacy encryption unlock. NFC Smart Ring?Through the NFC radio frequency communication technology and mobile phone connection to the mobile phone function operation and sharing of data.Mounting Type: Adhesive. Item Dimensions LxWxH: 1.57 x 1.97 x 0.2 inches. Color: Size7. Brand: Awstroe. Manufacturer: awstroe. Date First Available: August 21, 2020. Best Sellers Rank: #225,674 in Electronics. Customer Reviews: 2.2 out of 5 stars 7 ratings 2.2 out of 5 stars. Item model number: awstroebw2rhv54qc-02. : B08GF9972F. Item Weight: 0.329 ounces. Product Dimensions: 1.57 x 1.97 x 0.2 inches.