Razer Nommo Pro – 2.1 RGB Gaming Speakers THX Certified full range 2.1 gaming speakers Dolby Virtual Surround Sound technology ,Illuminated control pod with easy quick access functions ,Downward firing sub-woofer Powered by Razer Chroma™ 2 x 0.8 inch silk dome tweeters (1 x per speaker) 2 x 3 inch full range drivers (1 x per speaker).