IDS Home Pocket Plastic 8 Digits LCD Display Mini Calculator with Keyring Pocket LCD Digital Calculator with key chain. Material: Hard Plastic, Metal. Powered By:1 x LR1130 Button Cell Battery(not included) Size: 6.3 x 3.7 x 0.8cm/ 2.5" x 1.4" x 0.3"( L*W*T)