Made of high quality ABS plastic shell and non-stick plastic button, more durable. Easy-To-Read: Large LCD display, eye-angled, upright display^ The sensitive plastic buttons are also perfectly configured, total buttons and abdication buttons included, to meet any needs in the calculation. On and Off buttons, Profit margin %, +,-, Key Rollover; improving office efficiency and accurate calculation^ Tax and currency conversion, function and command signs. Multifunctional, can be used as desktop calculator in office, or business, travel^ Dual power supply, solar and 1 X AAA button power. Energy saving and environmental protection. automatically cut off the power in 10 minutes of standby, extend the button cell life^