The B3 has integral roller wheels, like a wheel barrel or a dolly so you can push it along at a 45 degree angle. The amp itself has one 15 main (running 100w at 4 ohms), an 8" mid/highrange (50w at 8 ohms), and two ports. Dual Channel with footswitch port- Channel one is bass/supermid/treble with gain, drive, master volume, and balancing between the two speakears. Channel two adds a 9 band graphic eq to the mix, giving the B3 a great tonal variety. Inthe back, there´s an XLR direct out for recording with your choice of 0 or -20 db to the mix and the main speaker. No extra speaker jack, but another speaker really wouldn´t help the amp´s sound. it´s meant to be a loner.