Congratulation for having acquired this body fat and hydration monitor(the device) as measuring device for your body fat percentage(fat%) as well as body hydration percentage( hydration%). The principle of this device is based on the measurement of bodys' electronic impedance known as bio-electrical term as Bio-electronic Impedance Analysis (BIA), a factor related to the body fat&hydration percentage and corresponded with the physical data (age, gender, body weight). Features and Specifications: 1.Memory, gender, height, age setting 2.Max input weight: 150kg/330lb/24stone 3. Min input weight:2.0kg/4.4lb 4.Weight data entering division: 0.1kg/0.2lb 5.kg/lb/stone convertible 6.Body fat measurement range: 4.0-45% 7.Body fat different resolution in %: 0.1% 8.Hydration measurement range: 37.8-66.0% 9. Hydration different resoluation in %: 0.1% 10.Main LCD digit size:0.8 inch(20mm) 11.Auto-off 12.Low battery power indication 13.Power:2*3.0V CR2032 lithium battery