Feature: 1. Fitness Ring: Achieve your fitness goals with this fitness ring. It keeps an accurate record of the distance you've run, calories burned, and time spent exercising so you can see your progress throughout the day. 2. Warm Feeling: Thanks to the low thermal conductivity of the nanocrystals and tens of thousands of CNC polishing cycles, they have a warm and jadestone like feeling; meanwhile, the delicate and compact body weighs only a few grams, so you can truly experience a comfortable wearing experience 3. Sleep Detection: The smart ring tracker evaluates sleep quality based on the ratio of REM sleep, light sleep and deep sleep throughout the sleep cycle and gives you appropriate recommendations. 4. Built In Temperature Measurement: Your body temperature is the key to understanding your body signals, the fitness ring has a built in temperature measurement function that detects the body surface temperature in real time and generates a temperature change report to keep you secure every day. 5. IP68 Waterproof Technology: Fully enclosed structure with IP68 waterproof technology, easy to handle daily waterproofing, wear it for swimming, hand washing, bathing, showering, etc. to meet your various waterproof needs. 6. Low Power Consumption: We use low power consumption control chip and 18mAh capacity lithium polymer battery, in depth power management and low power mode selection, which greatly improves the ring's endurance performance. Specification: Item Type: Smart Ring Battery Type: Lithium ion Battery Battery Capacity: 18mAh (shipped with built in battery) Battery Life: 3-5 days, depending on usage frequency BT Version: BLE5.1 BT Range: 3-5 meters Waterproof Rating: IP68 Compatible System: For IOS, for Android Charging Method: Magnetic Charging Wearing Instructions: Measure the circumference of the finger for wearing Material: Metal. Package List: 1 x Fitness Ring 1 x USB Cable 1 x Instruction Manual