Peoduct Name : Mini Calculator;Material : Hard Plastic, Metal Color : Clear;Powered By : 1 x LR1130 Button Cell Battery(not included) Size : 6.3 x 3.7 x 0.8cm/ 2.5 inch x 1.4 inch x 0.3 inch ( L*W*T);Key Ring Diameter : 2.3cm/ 0.9 inch Net Weight : 17g/Pcs LCD display and press keypads make the 8 Digits Calculator easy to use. 20 Keys included functions for basic four arithmetic operation, reposition and percentage. Pocket LCD Digital Calculator with key chain. You can hang it together with your keys. Package Contents: 4 x Mini Calculator Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.