Amazfit Bip has sleep tracking, pedometer and notifications, it has also GPOS (which will significantly shorten battery life), release in 2018, it can still las

Amazfit Bip has sleep tracking, pedometer and notifications, it has also GPOS (which will significantly shorten battery life), release in 2018, it can still last 4 weeks on single charge, you can buy used for 15-20USD here in Europe Don't expect advanced sport features like tide info or water sports, it has calendar events and can be used with open source Gadgetbridge app in phone.