Wolo's new POWER PLAY is a complete amplifier and speaker system all-in-one, for the vehicle owner that wants to be heard. Designed to boost the sound of any iPod, MP3, CD and more. POWER PLAY is compact in size with all of it's solid-state amplifier circuitry built into the weather resistant case. Connecting an audio player to POWER PLAY is easy; simply insert the wired jack (provided) into the audio player's headphone outlet and hook-up is complete, without any tools. Turn on the audio player and use the volume control of the audio player to increase sound output to be up to 40-watts of powerful sound. The amplifier is built with the latest state-of-the art technology, turning on automatically only when the audio player or horns model (336 and 345) sends an audio signal POWER PLAY. When the audio stops, the smart technology of POWER PLAY turns off the amplifier. Comes complete with cigarette lighter 12-volt DC and 110-volt AC adapter for home use.