Material	Body: 304 stainless   steel, IP plating   Inner ring: resin grouting
Color	Ring: Silver/Space   Black/Gold   Power Charger: Black or White
Waterproof	5 ATM
LCD display	No
Smart function	No
Health	Automatic sleep tracking, activity, heart rate,   blood oxygen, HRV stress, mood, fatigue levels
Sports	25 exercise modes to   record and view your exercise data, including steps, distance, calorie, heart   rate, pace and more.
Battery	Battery Size: 18mAH    Charger: Charging Cable,   Charging Time: 1H   Normal Use: Up to 7 Days,   Standby Time: Up to 15 Days
Apps & Compatibility	ZDFIT   Android 8.0+ / iOS 12+
Product size	Ring Width: 7 mm   Available Dimensions:    Size #7 (Diameter 17.4 mm)   Size #8 (Diameter 18.2 mm)   Size #9 (Diameter 19.0 mm)   Size #10 (Diameter 19.8 mm)   Size #11 (Diameter 20.6 mm)   Size #12 (Diameter 21.4 mm)   Size #13 (Diameter 22.2 mm)
Weight	4.5g