Powered by a built-in rechargeable battery ; Charge for 2 hours and get 10 to 12 hours of play</br>The more hollow the object, the better the sound quality</br>Works with any audio device that has a standard 3.5 mm headphone jack</br>Perfect for: traveling, parties, the office, around the house, and anywhere else you want to Rock-It</br>Includes: Rock-It Portable Vibration Speaker with built-in Lithium Ion Battery, USB Power & Charging Cord, and Two Extra Sticky Pads</br></br>Product Description</br></br>As Seen on ABCs hit show Shark Tank. The Rock-It portable vibration speaker system takes music from your device and turns it into vibration sequences. It sends those vibrations through the Rock-It pod which sticks to ANY object. Simply press play on your device and the Rock-It will turn that object into a speaker! Now with a built-in rechargeable battery!</br>