Lenmar Coin Cell Battery Replaces OEM Citizen 280-51 Omega 9945 Panasonic SR920W Replaces: Citizen 280-51, Omega 9945, Panasonic SR920W 1.55V / 40mAh Silver Oxide 30 Day Warranty Watch or calculator battery replacement Compatible with devices requiring a SR920W battery 1.55 volts, 40 mAh, silver oxide, high drain battery 1 per pack 30 day manufacturer's warranty