Technical Pro 72-MO500 Active/Passive Studio Monitors with USB and SD, Wood (Discontinued by Manufacturer) 1000-Watts Power, 3-Inch Tweeter/5-Inch Woofer, Inputs on Active Speaker: RCA, USB flash drive, SD Card, MP3 Outputs on Active Speaker: Speaker wire, USB & SD Card maximum size: 32GB, Plays .MP3, .wav, .wma files from USB drives and SD Cards iPod can play through USB input, Record from the RCA inputs or Tuner onto the USB or SD Card inputs, Impedance: 8 ohms Recordings onto the USB flash drive, SD Card will be .wav file format, Dual 1/4-Inch microphone inputs, Powered speaker powers itself and passive speaker Microphone volume & echo controls, Volume, bass & treble controls, 110V