Letike F8 smart watch heart rate monitor blood pressure smartwatch display Sleep Fitness Tracker Android IOS
For the problem that the bracelet can measure the heart rate in things and in the air, the following explanation is made:
1.At present, the mainstream heart rate bracelets on the market adopt the same measurement method. The principle is not complicated, that is, the PMG signal of the radial artery is obtained by the reflective photoelectric measurement method, and the fast Fourier transform is performed on the PPG signal to analyze the frequency domain. To achieve the detection of the human heart rate. To put it simply, it is to use a light to the artery and then reflect it back. Based on the change of the reflected light, the heart rate of the human body is calculated.
2.Due to many factors such as the physiological structure of the human body, the color of muscles and blood, green light is the color with the highest passing rate in the human body. Therefore, the light source of the heart rate sensor uses green light to achieve minimum loss and interference.
3.Heart rate wristband detection focuses on human tissue. Some data is also read for non-human objects. This is a known and normal phenomenon. After the data is based on the principle of light reflection, the heart rate detection will have a reading. This situation cannot be All avoided, so there will be problems with heart rate data in the case of heart rate bracelet (table) in the case of “air test”.
How to use it >>
step 1 : Please charge your new device for at least 10 minutes or more before the first usage, this ensures normal device boot and optimal operation.
step 2 : Power on ( long-press 5-7 sec this button to power on )
tips : long-press button you can Switch to power on /off page , back to home
step 3 : download app ,Please search “Wearfit 2.0 ” in your APP store and android market . and then download it ,and then Bind Bracelet ,(first time open APP ,click bind bracelet ) your device bluetooth ID name is “F8**”
step 4: open phone bluetooth ; search bluetooth in APP ,and connect bluetooth F8
step 5 : once your bleutooth has been connected, the Data will be Sync , and watches time will Sync with your phone
step 6: you can click mine ,to fill in your information
step 7: you can click device management , setting call reminder / message reminder etc function
FQA for F8 fitness tracker >>
Why does the pedometer not count steps when I have already started walking?
To reduce errors, smart watch usually sets an initial value of 10, it will count steps when we walk more than 10 steps. The APP will show the real walking steps and start counting from step 10.
What application is used when connecting to a smart phone?
The app is designed by the supplier. You can scan the QR code on the package or manual to download it when you get the item.
Why the device cannot boot or start up properly?
Please charge your new device for at least 10 minutes or more before the first usage, this ensures normal device boot and optimal operation. For devices with removable batteries, ensure they are properly installed before charging.
We can deliver orders to most countries. For a detailed explanation of each shipping method, destination and approximate delivery time, please check our website
Can not find device when pairing device?
Please make sure the distance between phone and device less than 0.5m
Please make sure the device is not under low battey.if there is still problem after 1.5hours charging,Please cantact us.
Can not connect the devicewith app?
Some smart phone bluetooth service will be abnormal when reboot.Please reboot the smart phone for pairing device.
Why the android mobile disconnect?
Android mobile phone system memory management will be forced to turn off the background app,you need to turn off the power saving mode or pull the app into the ayatem housekeeping green background inside,app will not be forced to close.app must be running in the background,bluetooth will not automatically disconnect.
No incomming call or message notification?
A:Please see the splution of the app into “setting”-“FAQ” to find how to solve this problem
1) You have 7 days to contact us and 30 days to return it from the date it was received. If this item is in your possession more than 7 days, it is considered used and WE WILL NOT ISSUE YOU A REFUND OR REPLACEMENT. There are NO EXCEPTIONS! Shipping cost is bear by both seller and buyer in half.
2) All returned items MUST BE in the original packaging and you MUST PROVIDE us with the shipping tracking number, specific reason for the return, and your order number.
3) We will refund YOUR FULL WINNING BID AMOUNT, upon receipt of the item in its original condition and packaging with all components and accessories included, AFTER BOTH Buyer and Seller cancel the transaction from aliexpress. OR, you may choose to have a replacement.
4) We will bear all the shipping cost if the product(s) is (are) not as advertised.