The milwaukee c12 jsr 0 compact jobsite radio has an advanced technology digital display tuner for high reception and clarity and a mute button for instant volume kill its weather proof aluminium speakers produce a rich full sound it has a 35mm jack plug for auxiliary connection and an mp3 player compartment that is weather proof it can use an ac adaptor and 12 volt li ion batteries as a power source please note this unit does not act as a battery charger supplied with an ac power cord no batter