SF-550 Digital Letter Weighing Scale, 10 kg/ 0.5 g, for Parcels, Letters, Kitchen and other home and office use. 10 kg scale with multi units Designed with a wide LCD screen; it can automatically lock the reading when data is stable. With low power consumption, LCD Display with Auto Lock Reading SF-550 is powered by two AA batteries. And this scale will automatically switched off when it is in non-use condition in order to save power. Altogether, this digital is perfect for use to use in the office, home or kitchen.