Heart rate monitor:
1. This smart sports watch is 24h real-time Bluetooth strapless heart rate monitor and silicone health wristband take the green LED light to monitor the blood flow rate, through the complex algorithms to get data
2. Adopt silicone labs Si1142 sensors, figuring out the heart rate

Activity monitors:
The best fitness trackers can track your daily sport exercise, the functions as follows:
1. The time on the rubber wristwatch will auto-sync with the phone time
2. Calorie burned tracker device: electronic calorie burner tracker helps you make plain
3. Step counter: pedometer bracelet is counting the walked steps, the wireless activity wristband' s data is accurate if steps are over 30
4. Distance tracking: calculating the walking distance, completing your plan
5. Heart rate monitor: 24h tracking heart rate, making a nice plan
6. Sleep monitor devices: fitness tracking bands can track sleep time and quality (make sure to sleep with wearing it)
7. Remote camera: taking photos by turning over the wrist.
8. Find phone: when cell phone is over 5m away from you, the smart band will vibrate

Vibration alerts:
When have calls, SMS or clock, the top rated fit bracelets will vibrate to remind you and sedentary reminder function makes the wearable active fitness tracker remind you to drink or move the waterproof smartwatches fits for most phone like apple and android phone, personal kids fitness tracker band fits for iPhone 6, Samsung

Notice:
1. Not working: make sure whether there is electricity, besides, our products all set transportation mode, so you should press longer to turn it on in the electricity
2. Won't charge: check whether the charging port and charger are poor contact, press them tightly to make them contact completely