- They advertise 5 days charge but I get maybe 3 days. 4 at best.

- The heartrate reader is only accurate when you're at rest. Any sort of sweat or physical activity and the reading becomes wildly inaccurate or just stops working.

- The app takes like 5-10 minutes to sync every time and it won't sync in the background. So when syncing, I have to move my finger around on the phone so my phone doesn't lock and mess up the sync. I live in China so that might be the issue here. YMMV

- It does auto detect but I have a Vespa scooter so everytime I ride my scooter, it counts it as me walking a shitton of steps and I have to manually go on the website to delete those activities. This is also occasionally an issue in cars.

Overall, just dissatisfied with how this product works.