1 Piece is just One 3v Lithium Batterycr2032 Button Cell Battery 3V Coin Lithium Battery For Watch Remote Control Calculator cr2032Application: Laser Pointers, Clocks, Watches, Calculators, Computers, Digital Cameras, PDAs, Remote Controls, Camcorders, Electronic Gaming devices, Electrical Instruments, MP3 Players, Digital Voice Recorders, Toys,Glucose, Cholesterol Testing Meters e.t.c.CMOS Lithium battery Provide excellent continuous power.Can be used with toys, calculators, laser pointers, cameras, clocks, watches, computers, games, digital cameras, camcorders, PDAs, remote controls, electronic instruments, MP3 players, digital voice recorders, glucose meters, cholesterol testing meters, LED lights and other electronic appliances .High energy density, long life expectancy.