Roland CUBE Street EX 4-Channel 50-Watt Battery Powered Amplifier Angled back for use as a stage monitor; mounting hole for use with optional ST-A95 . (Best with Polaroid AA Batteries) Power: 50W (25W & 25W stereo)AC or battery-powered (5 hours at 50W; 10 hours at 25W; 20 hours at 10W)Speakers: 2x8" woofers; 2x2" tweeters Four independent channels for connecting a variety of mics, instruments, and audio devices Two XLR mic inputs allow two vocalists to perform at once COSM tones for electric guitar, including Clean, Crunch, and Lead; preamp for acoustic guitar provides clean, natural sound