Becausethis Apple Watch screen protector is a protective sticker, it can’t be one size fits all for obvious reasons. But the two links below will get you the right screen protector for 38 mm Series 1, 2 and 3 watches, 40 mm Series 4, 5, 6 and SE watches, 44 mm Series 5 watches, Series 6 SE watches and 45 mm Series 7 watches. Thescreen size of the Apple Watch Ultra is 1.93” (49 mm) diagonal with a resolution of 410 x 502 px at 338 ppi. Description Apple claims that the Apple Watch Ultra is the watch for extreme activities like endurance sports, TheECG app is available on Apple Watch Series 4 or later (not including Apple Watch SE). The irregular rhythm notification is not designed for people who have been previously diagnosed with Afib. Apple Watch Series 6 (GPS + Cellular) can use a cellular connection for Emergency SOS. To use Emergency SOS on an Apple Watch Ifyou have Apple Watch 5 as your signature suggests, they came in 40mm and 44mm sizes. You can use a ruler to measure them. You can open the watch app on your iPhone and go to General > About and note the model number and check the number in this link --> Identify your Apple Watch - Apple Support TheApple Watch SE is available in 40 mm and 44 mm sizes. The 44 mm watch has a height of 1.73” (44 mm), width of 1.5” (38 mm), depth of .41” (10.4 mm), and AppleWatch Series 5 GPS: Style: Modern: Screen Size: 44 Millimeters: Special Feature: Time Display, Accelerometer, GPS, Misxi 2 Pack Hard PC Case with Tempered Glass Screen Protector Compatible with Apple Watch Series 6 SE Series 5 Series 4 44mm, Black Apple Watch SE (2nd Gen) (GPS, 44mm) - Midnight Aluminum Case with AppleWatch SE; Band/Loop; 1m Magnetic Charger to USB-C Cable; The case materials and the band types would be based on your selection. Apple Watch SE have a water resistance rating of 50 meters under ISO standard 22810:2010. This means that they may be used for shallow-water activities like swimming in a pool or ocean. However, they should EASILYCUSTOMIZABLE — Available in a range of sizes and colors, with dozens of bands to choose from. Change up your look by switching your band or by customizing your watch face in millions TheApple Watch SE's comes in 40- and 44-millimeter sizes. Apple Watch Series 8's comes in 41- and 45-millimeter sizes. The ruggedized Apple Watch Ultra's only comes in a single 49-millimeter size AlwaysOn Retina display Nearly 20% more screen area than Apple Watch SE and over 50% more screen area than Series 3 Retina display GpYn.