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How to connect with the smart watch?
https://plus.crrepa.com/app-download/dafit
Step1: Download the DaFit App (scan the QR code in the user manual or search for “DaFit” in the App Store). 
Step2:Turn on Phone’s Bluetooth on Setting.
Step3:Open the DaFit App. click “ADD A DEVICE” 
Step4:Search the “C20_Pro” device, tap it to bind. (Please fully charged it when the first time to use.)
*Note: Please do not connect the watch with phone’s Bluetooth directly, otherwise some functions may not available.
How to use the call receiving and dial function?
Step1: After the mobile phone is successfully connected, please click to allow “Pair” and “Allow” notification. 
Step2: Swipe down the watch homepage,tap “Setting” and turn on the “Call” function. 
Step3: You can now use your watch to receive and make calls.
*If any questions, pls feel free to contact us directly, we will try our best to help you solve it, provide you with satisfied reply.