Specifications Hign-concerned Chemical:None Model Number:RC20 Function:Message Reminder Activity Tracked:Activity Tracker,Steps Tracker,Calorie Tracker Item Weight:3.2g Case Material:STEEL Certification:ce Brand Name:SIMSONLAB Battery Capacity(mAh):15mAh-20mAh Waterproof:IP68 APP supports languages:Russian, Hungarian, Turkish, German, Italian, Czech, Slovak, Japanese, French, Polish, Persian, Simplified Chinese, Traditional Chinese, English, Portuguese, Spanish, Vietnamese, Arabic, Korean, Thai and other 20 languages Connection method:low-power Bluetooth 5.0 APP:SmartHealth Features 1. Sports, with multiple exercise modes 2. Sleep monitoring: app big data analysis to help understand sleep quality 3. New upgrade of the motherboard solution: better performance 4. IP68 waterproof: fully enclosed structure to meet various waterproof needs 5. Weight: 3.2g, ultra-light weight, no sense of wear 6. Compatible system: Android 5.0 and above; Hongmeng system supports; IOS 10.0 and above APP supports languages: Russian, Hungarian, Turkish, German, Italian, Czech, Slovak, Japanese, French, Polish, Persian, Simplified Chinese, Traditional Chinese, English, Portuguese, Spanish, Vietnamese, Arabic, Korean, Thai and other 20 languages Packing list: Ring, magnetic charging cable, instruction manual, QC label, packaging box