Features: Dual-power source: This electronic digital calculator supports battery and light energy power supply. If the battery suddenly runs out you can switch the power mode to continue using the calculator which brings you more convenience. Practical product: Bright colors and reasonable button design make this compact handheld calculator which is easy to use and carry as well as store. This basic standard calculator is useful stationery for home school and office also a fun gift for friends and kids around you. Specifications: Material: ABS plastic electronic components Size: 4.7 x 2.7 inches/ 12 x 6.8 cm Color: as pictures show Digital display: 8 digits Power source: button battery light energy Package includes: 2/4 x Calculators