Nickel metal hydride battery (Ni-Mh). Contains 0% cadmium. Extra high capacity compared to NiCd batteries. Suitable for radios, CD players, cassette players, mp3, torches, camera equipment, etc. Can be recharged up to 1000 times. R2U technology means the batteries are charged and ready for use straight from the shelf. Auto-discharge from the batteries is lower and they maintain their voltage longer than other rechargeable batteries.