DESCRIPTION Basic Parameter: Inner diameter size:7 #17.25mm, 8#18mm, 9#19mm, 10 #20mm, 11 #20.75mm, 12#21.25mm Color: silver \ gloden\black / Weight: about 4.5g Chip: FR8016HA / APP: Jring CompatibleSystem: Android5.0+,I0S10.0+ Chip: FR8016HA / Heart rate sensor: hr3605 / Battery Type: Polymer battery 15-18mAh Bluetooth version: BT5.0 Charging Method: Magnetic charging Life time: Use time: 5-7days 1.Stainless steel 2.Smart Chip: Equipped with the latest intelligent ring chip DiaLog rich in features and long battery life 3.Health monitoring: able to monitor heart rate, blood oxygen and blood pressure in real time, helping users to know the health condition at any time. 4.COMFORTABLE SLEEP: Intelligent recording of sleep information including deep sleep, light sleep and awake time to help improve sleep quality. 5.Exercise life: support multiple exercise modes, real-time recording of exercise heart rate, speed and time and other information. 6.Control photo: By accessing the remote control photo function through APP, you can use the ring to remotely control your cell phone to take photos and record beautiful moments. 7.IP68 Waterproof: With IP68 grade waterproof effect, suitable for daily wearing when waterproof. 8.Size: provide #7 #8 #9 #10 #11 #12 standard size, users can choose the right size according to the need. 9.Optional charging compartment: you can choose to have a charging compartment for easy charging and storage. Please don't hesitate to contact us if you have any questions or concerns before or after your purchase. We are committed to your 100% satisfaction. 1.Shipping Cost: Select the quantity first, then click the country via logistic methods in the page. 2.Go the the next page, you can see the detail shipping cost by each logistic methods under your selection. 3. Item Processing Time: The processing time for a specific order varies with the product type and stock status. Mostly, processing time can be 3 to 15 working days. Since your feedback is very i