Multi-functional scientific calculator, nice helper for data dealers, improve your efficiency and accuracy Features: Dual power ways: Solar power or 1pcs AAA battery, energy saving and convenient. (Battery is not included.) Adopt Japanese LCD screen, 12 digits, display data clearly. Support +/-(negative),percent ,√ calculation. Support Rounding off & decimal place setting. With CE/C (part/all clear), MC/MR/M+/M- (memory) key. Auto shut-down in 8min if no further operation. Big ABS plastic button, offer accurate positioning and comfortable texture, support more than 1 million times press. With non-slip silicon on the bottom for stability. Multi-functional scientific calculator, nice helper for data dealers, improve your efficiency and accuracy Specifications: Model: OS-2135 Pro Item Size: 19 * 15.5 * 4cm / 7.5 * 6.1 * 1.6" Item Weight: 300g / 10.6oz Package Size: 19.8 * 16.1 * 4cm / 7.8 * 6.3 * 1.6" Package Weight: 341g/12oz Package List: 1 * Calculator 1 * User Manual(English/Chinese) Note: Battery is not included.