Product information: 1. Before using it, please take off the old case and film of the watch! 2. The case is made of PC+Glass, which is convenient to use and better protect the watch! 3. If you want to realize the ECG function of the watch, you need to remove crown of the watch case before using it! Features: 1. The full-screen picture with high light transmittance is not blocked, and you can enjoy the beauty of naked machine 2. The side hole position is strictly 1:1 mold opening, the rotating crown is not jammed, and the power key is pressed without resistance 2. High-intensity resistance to daily bumps and effective prevention of screen breakage risk Packing list: Watch case*1