Description of ROCK ANYWHERE: TWS - True Wireless Stereo. The TWS function allows you to wirelessly connect 2 of these speakers together to give you stereo sound. This will give you a left and right channel which will give you true stereo surround sound. If you want amazing sound in your bedroom you can just put one of these on each side of your room and it will sound like you have a full surround sound speaker system.. . IPX7 Waterproof and Submergible. The ROCK ANYWHERE is 100% waterproof. You can take it with you into the shower, or inside the pool and it will never get damaged.. . Amazing Power with Bumping Bass!. This speaker puts out a huge 20 watts of power. It sounds impressively loud and clear. This speaker has great bass and crystal clear highs with a distortion rating of less than 1%. What makes the bass so loud is that the speaker has 2 passive radiators to enhance the bass. That basically mean the speaker has 2 extra subwoofers built in that focuses on playing back bumping bass!