The OnePlus Watch 2 Silver/Blue works with all Android smartphones. The OnePlus Watch doesn't work with the Apple iPhone. You can download your favorite apps via the Google Play Store on your smartwatch, like Spotify. That way, you can control your music and read all of your messages on your wrist. You can also use the smartwatch to make phone calls if you have your smartphone with you. The battery lasts 3 days. The OnePlus Watch 2 is 47mm, so it looks best on a large wrist with a circumference of at least 19cm. You can keep track of your health and activities, because you can measure your sleep, stress, VO2 max, and your recovery time after a workout. Thanks to the stainless steel watch case and the sapphire glass screen, your watch is scratch-resistant. Note: a charger isn't included. Want to charge the watch via a socket? Use the charger of your smartphone or order a separate charger. This watch is recommended for a 17 to 19cm wrist circumference.