Summary: The last of the solar only calculators, no auto shut off (good) no "back up" battery (great). I'm a guy with a 54 year old car, a 127 year old house, and a 1937 washing machine. (Not to mention a 1929 under counter refrigerator) all work perfectly.
Summary: The unit is perfect in condition. Connect with my Mac easily and the function is good. I was using Logitech numpad calculator but less function than this unit. I will shift to this unit instead . I got both Bluetooth version and USB wireless version. If you can find another Bluetooth unit.