BAZIC 8-Digit Pocket Size Calculator With Neck String. Colors: black, blue, red & champagne(gold). Functions include square root key, % key and memory recall keys. Approximately 3.75" x 2". Each calculator has full function memory, constants for addition/subtraction/multiplication and division. Neck string adds styles and convenience. Compact size suitable to fit in any compartment. Includes battery. Has auto power off function. Ideal for school, home and office.