Features of 50CVX124: Dual Four-Ohm Voice Coils.Thick Polypropylene Cone.Double Blue Surround Stitching.Ribbed Santoprene Surround.SoloKon Cone Reinforcement.Suspension System.High-Strength Insulated Tinsel Leads.High Temp Voice Coil.Perimeter Venting for Thermal Management.Massive Ceramic Magnet.UniPlate Extended Pole Piece & Backplate For Superior Heat Dissipation.Cast Aluminum Basket. Description of ROCK EVERYWHERE: The Rockville ROCK EVERYWHERE is a true wireless stereo (TWS) Bluetooth speaker that you will want to bring with you everywhere you go because it sounds so good! The ROCK EVERYWHERE is a larger version of our famous ROCK ANYWHERE speaker. This model has a bigger battery, and even bigger sound! The passive radiator give this booming bass while the full range speakers give you loud and clear mids and highs. This speaker is loud enough to use outdoors and sounds clear enough for use in your bedroom or even in your restaurant. What makes this speaker special is that at high volume levels the sound is still extremely clear. 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 translates into 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! We use an advanced Bluetooth chip called the Actions 4.2 that has a dual core single chip with a DSP that we tuned to increase the sound quality. The advantage of this Bluetooth chip is that you get way better battery life, better sound, and better Bluetooth distance. The ROCK EVEYWHERE is 100% waterproof. You can take it with you into the shower or pour water all over it for fun and it will not get damaged. You can even submerge it in water for around 20 seconds without damage. This model has a built in powerbank that will allow you to charge your phone or other USB device.