Bro, you are losing weight right and trying to track your record from time to time right?

Unless you willing to spend on such devices which gonna help you on the short run, I would just strongly advice you just to ignore that device and just undergo a healthy lifestyle. Eat healthily, exercise regularly. Jog, swim, cycle, hiking are all cardio exercise which will burn your fats. HIIT is proven to be the best method in losing fat. You won't see great results in a week or two. Just maintain healthy lifestyle for a month and you can see some difference in your weight and physique.