Compact and portable but brimming with modern drum machine sounds, the Alesis SR-18 can produce anything from completely electronic to mimicking totally analog drum sounds. Not only does the SR-18 boast a huge sound bank, but it has tons of onboard effects as well, including EQ, reverb, compression, and more, for sonic shaping on the fly. And with the SR-18, you can go wire-free -- the entire drum machine is battery-powered.