This scale uses a micro-USB charger, making it a reliable tool to accompany your health journey. While protecting the environment and saving energy, it saves the tedious work of replacing batteries in the future. A two-hour charge can work for two months. The bright back-light display features a high contrast ratio which makes it very easy to read under any lighting condition. With 4 precise sensors measuring down to 0.1 lb / 0.05 kg increments, our scales provide accurate data, making it a reliable tool for your health journey. The hands-free Instant-on, Display Hold and Automatic-off features are very user friendly. Simply step on the scale to weigh-in and step off when you are done.