This large key calculator is a must for any business person, accountant, teacher, student or someone who needs to make any sort of calculation. This easy to use calculator is also convenient gift for family or friends!Features:Large LCD display and sensitive buttons: Its large display is easy to read, reduces your eye fatigue, and can help you (including the elderly) see clearly and calculate happily. Its spacious button size can ensure that the possibility of your finger tapping mistakes is greatly reduced, thus saving your energy and time.Dual Power :The dual power supply of solar and battery (including one AA battery) ensures consistent and reliable use in any environment.Stable on Desktop: This large calculator completely kisses the desktop and 2 anti-slip mats on the back, won’t slide, make sure your key presses are accurate.Premium quality: The combination of three-color buttons and brushed metal panel is high-end and durable, very suitable for daily use in the office (please remove the protective film of the panel first).Key Operations:[AC]: power ON / clear memory.[CE]: Clear error.[EX]: Exchange key.[+/-]: Sign change key (Changes the sign of the displayed value from positive to negative, or vice versa).[MC]: Memory clear.[MR]: Memory Recall (Effective before pressing MC key ).[MU]: Stands for Mark Up, which is for calculating GROSS PROFIT MARGIN (GPM).[M+]: memory plus (adds the displayed value to the independent memory).[M-]: memory minus(subtracts the displayed value form the independent memory).[GT]: Whenever the [] key has been pressed, the result will be stored into the Grand Total Memory.Package Includes:1 x Desktop Calculator1 x AA batteryNote:The power provided by solar panels in a dim environment is limited, please install the battery before use.