I don't remember when I bought it, but I haven't used it much. It's made by SHARP, so the buttons are large and feel good to the touch. It seems like it would be useful in situations where you're negotiating prices with customers at a store. The following is an automatically generated comment by AI: The SHARP twin-power calculator EL-M712K features a large LCD display. - Brand: SHARP - Model Name: EL-M712K - Function: Twin-power calculator - Display: Large LCD display - Country of Manufacture: China - Instruction Manual: Included