- Ansmann 9V lithium battery, model 5021023-01-590-1, specially designed for smoke detectors - 1100mAh capacity provides up to 10 years of service life - Offers up to 700% more power compared to standard alkaline batteries - Free of mercury and cadmium, environmentally friendly - Operates efficiently in extreme temperatures from -40°C to +60°C - 35% lighter than 9V alkaline batteries, making installation easier - Longlife technology for reliable and safe performance - Red color for quick identification in devices