Solar power and battery backup allow desktop calculators to work in low light conditions This pink calculator can handle solar power (only works when it's light) 1 5V battery as backup battery and automatic power supply (without battery) Comfortable and durable silicone keys, ABS plastic material, light weight Reasonable configuration and comfortable use Non-slip design, non-slip washers are not easy to slip during operation Beautiful appearance, 12-digit display, large digits are easy to read Large, responsive keys for simple calculations, perfect for the office, elementary school, market or home Dimensions: 15 x 12 cm, Weight: 150g (1 piece) Doesn't take up much desk space, but is large enough to be comfortable to use Automatic shutdown if not used for about 10 minutes