Change to Ultra Case For Apple Watch 42/46mm PC Cover iWatch Series 10 9 8 7 6 5
Compatible Models: For Apple Watch Series 7/8,For Apple Watch 45/41mm,For Apple Watch Series 4/5/6/SE,For Apple Watch 44/40mm. If you want to realize the ECG function of the watch, you need to remove the crown of the watch case before using it!