The SP-HF1200B speakers have a 36 watts (RMS) audio output, perfect upgrade sound quality for music, movie, or gaming. Adjustable Volume, Bass and Treble controls: Adjustable Bass , Treble and Volume controls/Line-in and Headphone jacks 2” tweeter and 4” woofer drivers: 2” tweeter for soft and smooth treble sound ，4” woofer drivers for extended bass Power Code: AC switching transformer built in (100-240V)