Highlights It's made in Japan. It can be used in watch, calculator, some remote controls & other microamps level battery applications. Choose the right model of your applications & you will feel good service. Do not recharge or dispose of in fire. Keep in a dry & cool place. Specifications Weight Approx:0.28g/pc Size Approx:5.8x 5.8x 2.1mm/pc Model:SR521SW/379 Voltage: 1.55 V Service life:5 years