Review on 💪 MGcool B3 / B4 Fitness Tracker Smart Band: Keep Track of Heart Rate, Activity, Sleep, and More! by Crystal Barter

Let's start with the first shortcomings that I noticed. The instruction manual is worse than the Ikea assembly plan. It itself is constantly changing from a digital readout (which is actually very legible and has a nice display) to an analog format that's harder to read due to the size. Then after 2 weeks the time has lost by almost 10 minutes. The reset time had to be repeated. In less than 2 months it wouldn't turn on at all, even after an overnight charge.