SPECIFICATION Max Weights: 396 lb / 180 kg, Min Weights: 0.4 lb / 0.2 kg Unit: lb / kg / st Platform: Tempered Glass Power: 4 AAA Batteries Required Dimensions: 310 in x 310 in x 25 mm NOTICE 1. Please use the scale for the body weight on flat and hard floor 2. The arboleaf smart scales will auto calibrate before first weighing. When the weight scale has been physically moved, second weighing after calibration is more accurate 3. Human body weight changes during a day, which is lightest in the morning and heaviest at night. The difference between them is about 1 to 6 pounds. Therefore, You should use this smart scale at the same time every day 4. A “LO” reading on the screen means the battery power is low and the batteries should be replaced. Please replace them with new batteries for accurate measurements. 5. A “CAL” reading on the screen means calibrating PACKAGE CONTENTS 1byone bathroom scales x 1 Tape Measures x 1 AAA Batteries x 4 Maintenance Recalibrating the wifi weight scales If the scale digital weight and body fat has been moved or flipped upside down it must be recalibrated to ensure accurate results 1. Place the bluetooth scale on a hard, flat surface 2. Step on the arboleaf digital scales with one foot until the digits appear on the display, then, step off 3. The arboleaf body weight scales will show"CAL then"0.00", indicating that the calibration process is complete. Nice choice of father's day gift