Dual-Frequency High Precision Measurement: XIAOMI Smart Bathroom Scales S400 adopt dual-frequency BIA with large 58 mm electrodes, delivering precise readings accurate to 0.05 kg (0.1–150 kg range) and DEXA-level body composition tracking at home. 25 Body Composition Metrics Analysis: S400 smart scale measures 25 metrics (including weight, BMI, visceral fat, muscle mass, water, protein, and bone mass) with heart rate detection. The Xiaomi Home App generates trend charts and customized fitness advice. Unmatched Stability for Accurate Readings: S400 weighing scales body weight feature step-on auto induction, auto power on/off, self-calibration, and a low-battery reminder. It syncs calibration records and device status via the Xiaomi App — no manual hassle required. Multi-Scene Modes & Privacy Protection: S400 bathroom scales feature baby weighing, balance test, and small-item weighing modes for diverse use. Guest mode won't save strangers' data. All records are sorted separately in the Xiaomi App for privacy. Upgraded Platform & Long Battery Life: Features a hidden LED screen that displays weight, body fat, and heart rate. Its 300×300 mm anti-slip tempered glass platform and large 58 mm electrodes deliver accurate BIA measurements. Powered by 3 AAA batteries (180-day standby), it is perfect for any room.