Specifics Brand: PKCELL May also be known as:CR1220, BR1220, DL1220, ECR1220,E-CR1220, KCR1220,SB-T13 Model: CR1220 Lithium Battery Capacity:40mAh Volt: 3V Chemical Composition: Lithium Shelf Life: 5 years (not printed on battery) Diameter:About  12.5mm / 0.49" Height:About 2.0mm / 0.08" Conversion : 1mm = 0.0393 inch Application:Thermometer , toys,watches,computers,games,digital cameras,calculators,clocks,laser pointers,camcorders, remote controls,PDAs,electronic instruments,blood pressure monitors, glucose meters, hearing aids,flash,strobe and so on   Note:  A: Some customers are confused about model number.  Different callings. For example, CR2032 is also called 2032 or ECR2032 or DL2032. Actually they are the same. B: Sometimes we hear from customers that they bought wrong size for their devices.  That's very understandable. Because those button cells are very small and look very very similar from pictures. Voltage are all 3V. Material are all Lithium. The differences are dimensions. Tip: The battery is named by dimension!   CR2032   20(D)*3.2(H)mm CR2025   20(D)*2.5(H)mm CR1220   12.5(D)*2.0(H)MM