Specification Desktop Calculator User friendly programming/operation Cost / Sell / Margin feature calculates ANY variation. means that you can view all 3 parts of your final answer. Programmable one-touch Tax feature. Ideal for adding or subtracting VAT. Automatically turns on & registers when pressing ANY key, so you can start using the machine instantly Rounding & Add mode Decimal point selector settings: 4, 2, 0 & Floating 4 constants Adjustable large 12 digit display Durable hard keys Backspace correction key +/- Change sign key 4 key memory Square root Solar power with battery backup (Wx Dx H) 105 x 175 x 17mm Backup battery ref: LR1130 or BSR54H