Calculate on-the-go | This compact and lightweight 8-digit calculator is perfect for use on-the-go weighing in at just 50 grams | The dual solar and battery power source will ensures that the battery doesn't run dry when you need it most | Enjoy dual power capabilities - Save battery and use your pocket calculator for longer, with solar and automatic battery back-up | Small in size, big in quality - It's small and portable but boasts all the functions you need, including an auto constant feature to regularly multiply or divide by the same number.