Features:
About heart rate: if it is not accurate, please check if there is a gap between the watch and the arm

If you have any questions, contact us by email, we will definitely help you to solve

Technical specifications:
- Item size: 4 * 1.9 * 1cm
- Bracelet size: 26cm length
- Battery: 70mAh Li-ion battery
- Use time: 4-5 days
- Charging time: 2H
- Warning: waterproof in daily life, but not in shower, swimming, diving

About our product:
- Accurate recording and feedback the daily goals
- Pairs with heart rate monitor for fitness activities
- Monitor sleep automatically and wake with a silent alarm
- Track workouts, heart rate, distance, calories burned, active minutes and steps
- Smartphone finder, lose alarm
- Remote control selfie

Compatible with:
Android Phone 4.4 or later: Samsung Galaxy S6 S6 Edge S7 S7 Edge Note 5 4, Nexus 5X 6P, Oneplus One Two, HTC M8 M9, Sony Xperia Z4 Compact Z5 Z5 Compact
iOS 7.1 or later: iPhone 4S, 5, 5S, 5C, 6, 6S, 6 Plus, 6S Plus

Packing includes:
1* smart Bluetooth bracelet
1* USB charging cable
1* user's guide