High quality alkaline battery for electronic devices. Special packaging protects against unauthorized access. VARTA's specialty alkaline batteries are mercury-free and are ideal for a wide variety of long-lasting energy applications such as toys, torches, insulin pumps, garage door openers and many more. They have a specially designed packaging that can only be opened with scissors. It protects against unauthorized access, for example from children. Technical specification: Type: 4223 Diameter: 10.3 mm Height: 28.5 mm Weight: 7.9 g Electrochemical system: Alkaline manganese battery Voltage: 12V