3.5mm / 1/8" Male Audio Input.1 Channel Speaker Audio Output.15W x 1 RMS Audio Output 150W x 1 Peak Audio Output.4 Ohm Stable.Designed for use with all audio players with 3.5mm /1/8'' audio outputs mp3, Ipod, etc. This amplifier takes input from a digital music player and boosts the signal for a richer, stronger signal. If you've got high end speakers, this device is a wonder - you'll hear parts of the music you've never heard before, and you'll never go back. For clarity, strength, and increased frequency response, try the PHA15. It's equipped with a mono 3.5mm male jack for input and a single speaker output. Requires a 12 V connection.