Marbig desk top calculator is solar powered with the added security of battery back-up for low light conditions | Ideal for calculations on the run | Extra slim design fits neatly into your hand and discretely slides away in a briefcase when not in use | Solar powered with the added security of battery back up for low light conditions | Features include 3 key full memory function, percentage and square root keys | Extra large 8 digit display for easy viewing | Soft rubberised keys for comfortable use - no more sticky keys