The Energizer 2032. Used in heart-rate monitors, keyless entry, glucose monitors, and most popular rifle scopes with illuminated reticles. Product Details Used in heart-rate monitors, keyless entry, glucose monitors, toys & games Holds power for 8 years in storage Performs in extreme temperatures (-22 to 140 F) Child Resistant Packaging Cell size: 2032 IEC: CR2032 Type: Lithium Coin Volt: 3 Replacement for: 5004LC, BR2032, DL2032, ECR2032, ST-T15 Mfg: Energizer