Murata produces batteries with excellent high performance and reliability, taking advantage of 40+ years of technology development and manufacturing expertise. These Murata CR1220 batteries are the perfect long lasting replacement for all your personal devices including keyfobs, blood sugar monitors, remote controls, digital thermometers, toys, calculators and more. Operating temperature: -30°C to +70°C (standard) -40°C to +125°C (heat-resistant). Nominal Capacity: 40mAh. Additional Details ------------------------------ Product description: 40+ years of technology development and manufacturing expertise. These CR1220 batteries are the perfect long lasting replacement for all your personal devices including keyfobs, blood sugar monitors, remote controls, digital thermometers, toys, calculators and more. Operating temperature: -10°C to +60°C (standard). Nominal Capacity: 18mAh Warranty description: