Perfect for independent math practice, the bright blue Primary Calculator is both solar and battery powered. Students can start with basic math operations and work their way up to percents and square roots. The 4-function calculator includes a 3-key memory, auto shut-off, and an 8-digit display. Measures 2.5" W x 4.5" H. Each calculator includes 1 AA battery. CHOKING HAZARD - Small parts. Not for children under 3 years.