100% Using Method: Set up your own data successively (user, gender, height, age). After that, starting to weigh without shoes15 Functions: weight, body fat, muscles, moisture, subcutaneous fat, visceral fat, protein, calorie, bone mass, BMIIt is very important to make sure that four feet of your scale stand steadily, which is related to whether the senor can transfer the imperceptible change of your weight into a sensitiv electric signal or not. If the floor is unsteady, the secale reading will be inaccurate.Data can not be locked or become much more lighter then the reality if you put your scale on a carpet or soft floor, because those kinds of floor will reduce some of the weight as you step on your scale.You can not put your scale between two tiles, because the floor between them may be uneven. You must put the scale on the middle of a big tile.If you tiles have decorative designs, the flatness of your scale will be influenced by depth of those designs.The wood floor with lattice is not flat at all.If you shake your body, the number of your weight will be unlocked. You should stand firmly on the middle of the scale, which will contribute to getting a more accurate number.CNC rounded corners, safety anti-collisionAutomatic power - offFree BatteryEnglish Screen DigitalColour: Black, PinkDimension (LxWxH): 29cm x 2cm x 26cmWeight: 1.30kgMaterial: GlassMaximum weighing: 180kgBattery: 2 x AAA batteries