Toshiba Batteries R6KG BP-4 TG SS-F 1.5 V Heavy Duty AA Carbon Zinc Batteries are a type of single-use battery that are commonly used in devices such as remote controls, toys, clocks, radios, alarm clocks, electronic keyboards, walkie talkies, microphones and garage door openers. They have a voltage of 1.5 volts and are made with carbon zinc technology, which is a less expensive type of battery than alkaline batteries. This Batteries are advertised as being heavy duty which means that they are designed to provide longer lasting power than standard carbon zinc batteries. They are also mercury and cadmium free, which makes them environmentally friendly. It comes in 4 pieces of set.