Bamboo Office Calculator 12 Digit LCD Display School Special Gift Christmas Calculate Commercial Tool Battery Solar Powered Features: 1.The calculator design of 12bits, the results don'for t round 2.When operation bits over 12, error handling, reset only by pressing the ON/AC 3,When inputing error,press the backspace for key to delete bit by bit. 4.The calculator automatically shut down after 12 minutes no-operation.then enter the sleep state,you can press ON/AC to awake it. 5.When the operation result beyond 12 negative,negative sign does not show. 6.Please avoid using it under the strong light Specifications: Power: SOLAR Dimension: about 170*82*19mm(6.69x3.22x0.75 inch) Supply Battery: solar for power, no need to replace the battery How to use? Please rup the LCD screen and solar panels with soft dry cloth,store in dry and cool place when it idle. it is forbidden to place the product in water or for sun exposure Package included: 1x Bamboo Elactronic Calculator