Tuner, USB/SD Card MP3 Player & Subwoofer Control, A/B Speaker, IPhone MP3 Input with Karaoke, Cable & Remote – PT270AIU. Auto station seek, Digital fluorescent output display meter, Separate subwoofer gain controls, USB/SD Card MP3 Player, 50 Radio station memory. Surround Sound Channel Configuration. 7.25 x 19.25 x 14 inches. 300W POWER OUTPUT: With a maximum output of 300 watts, the PT270AIU has the power to fill your room with sound. This amplifier also has the brilliant digital fluorescent display comes in clear and shows vivid information. It also has auto station seek helps you to enjoy listening to your favorite stations with capable of storing up to 50 radio station presets & quartz tuner to enjoy listening. MP3 PLAYER PLUG-IN: With this amplifier, you can enjoy listening to your favorite music. It has an iPod docking station, suitable for all iPod & iPhone models. With this docking station, you can connect your iPod while listening to different music. 4 STEREO RCA INPUTS: 3 Stereo RCA inputs along with 1 RCA stereo input for play media. SD memory & USB ports will also let you play your favorite media. It also has 2 1/4 inch mic inputs & mic volume, tone & echo controls for voice effects. A/B SPEAKER OUT SWITCH: This amplifier includes banana-plug speaker terminals, plus two mono RCA outputs which made for the subwoofer output, with its own separate gain control. It controls multiple sets of speakers with the A/B speaker out switch.