http://www.amazon.in/gp/offer-listing/B00HR32ILM/?sort=price&/ref=as_li_tf_tl Brand: Lenovo Includes: One subwoofer and two satellites Configuration: 2.1 channel In-built amplifier Power Output: 5W Compatible with: Laptops, smart TVs and a host of other electronic products Built-in amplifier USB powered comparison 1444 http://www.ebay.in/itm/Lenovo-2-1-Speaker-USB-C1530-/291417301917 1425 http://m.snapdeal.com/product/lenovo-usb-powerd-21-speaker/1354035