Pocket Calculator TM Optima O75528 mobile, compact model, which is suitable for a wide range of consumers. Popular among pupils and students. Standard set of functions: addition (+); subtraction (-), multiplication (x) dividing the percent (%) (?); (?) The square root of the memory register (M +; M -; MR; MRC), a change of sign (+ / -) eliminating all of the data from the display and memory (AS); vvednogo eliminate the last number (s / CE).