Xiaomi Mi Band 3 Bluetooth Activity Tracker, Waterproof Fitness Watch with Heart Rate Monitor, Pedometer & Messaging Notifications, Android & iOS – Graphite Black

Amazon.co.uk Price: £21.65 (as of 25/05/2019 09:33 PST- Details) & FREE Shipping.

0.78” full OLED touch display. Up to 20 days of battery life (110 mAh). 20 gr weight.
Displays battery life, real time heart rate, daily step count, calorie count, distance, date/time and sleep metrics.
Real time notifications on display with vibration: apps messages, incoming calls, caller ID, SMS, activity goals.