Excellent pairing with the phone, I have xiaomi. I see who is calling me without taking out the phone, it's convenient. I take a shower without taking them off, while swimming in the bathroom I still don’t risk with them, I take them off just in case. You can set up any alerts, even from a contact, even sms, viber, vatsap, etc., but the more there are all sorts of goodies, the battery will run down accordingly. But it lasts a week. You can pick up a bunch of different bracelets, on Ali their seaSee full review