20 speaker comes with a control knob for increasing or decreasing the sound the speaker is usb powered and has a 35mm jack so one can connect it to their laptop tablet or gadgets that support a 35mm auxthere are definitely more reasonably priced computer speakers out there but with this level of quality the zebronics zebfame 20 multimedia speakers is worth the cost of entrybose companion 2 series iii multimedia speakersthe bose companion 2 series iii multimedia speakers assures you of highquality audio performance with clear sound at any volume be it to play music games and videos on your computer these portable speakers offer significant sound quality at a very affordable price the speakers unique digital signal processing feature produces consistently clear full sound at any volumeso youll enjoy your favorite music videos and streaming content even more than before use the auxiliary input to bring bose performance to another audio source such as your iphone or ipad it features volume control and headphone jack in front of the right speaker disclaimer the times of indias journalists were not involved in the production of this article