Casio WaterproofDustproof Calculator Beige Mini Just Type 12 Digits WM-320MT-BE-N

[Number of digits] 12 [Size (depth x width x height) mm] 168.5 x 108.5 x 33.4 [Mass (g)] 175 Power source type: TWO WAY POWER (CR2032) Equivalent to IPX5 (splash-proof type) No harmful effects even if exposed to water splashes. Dustproof: Equivalent to JIS IP6X (dustproof type) There is no amount of dust entering that would impede the normal operation and safety of the product.