Smart BP HR SPO2 Bracelet M2S Smart Band Heart Rate Blood Pressure Pulse Meter Bracelet Fitness Watch Smartband for iOS Android (Red)

So far I love this "watch". Small, water resistant, multi-function. I supported a crowd-funded start-up to develop a similar looking wrist band that included monitoring hydration. They slipped their first deliveries from August of 2017 to summer of 2018, so I thought I'd try this for now.

Doesnt work correctly, bought two of these and they both have the same problem. Tough charged exactly like recommended in the user manual, the battery will only last for a few hours. Frustrating...