Specification: Screen: 0.91 inch OLED touch Display Material: ABS(part)+TPU(most) Waterproof: IP67 Battery: 3.7V, 75mAh Full Charge Time: 30 minutes Use Time: 7 days Stand by time: 12 days Data Storage: 7 days Compatible Device: IOS: IOS 8.0 or above Android OS: Android 4.3 or above Bluetooth: 4.0 or above Package Include: 1 x I5 Plus fitness tracker 1 x User's manual Important Important usage tips(follow this tip will resolve all cellphone connection problems): When first time use ,bluetooth need to pairing 2 times (a.Open APP "Zeroner", and search wristband then connect,will show dialog"cellphone with pairing" b.go to your cellphone buletooth setting,ignore wristband, then continue step a) Questions & Answers: Q1: Can i wear it to swim? A1: It is Water-resistant IP67. Little rain or water is ok. Diving or swimming is not advised. Q2: Can I use the tracker to text or dial? A2: Sorry no, it can only show the incoming call, text and other app notification. Q3: Can this tracker work alone? A3: No, a phone/tablet is needed. Q4: The tracker is not responsible, is it defective? A4:All tracker is tested before shipping out, please recharge it. Contact us if it still don`t work.