Portable music players
For hearing songs music player is one of the options. The portable music players are invented in the end of 20th century. In the early days many people like to here songs with the help of tape recorder. The tape recorder was in very huge size and it can’t able to move from one place to another place. Later some portable cassette players were launched in the markets. The portable players use batteries for playing songs and the life of the batteries depends upon the capacity of the batteries. Mostly rechargeable batteries are used in the portable players.