Rayovac�� Alkaline batteries are a great choice for a long-lasting power source and are ideal for daily usage. Alkaline batteries can be used to run a wide range of devices including calculators, electronic gadgets, smoke alarms, pencil sharpeners and wireless computer mice. Mercury-free formula.

Rayovac A1604-4F Mercury Free Alkaline Batteries, 9V 4 Pk One advantage of alkaline battery is longer shelf life, while another is it saves power when not in use 9V battery size for better reliance and optimal performance 9 V DC battery - Powers your multipurpose safely 9V battery - A convenient spare for your multipurpose, giving you peace of mind