The Thumper is a one-of-a-kind rechargeable vintage suitcase boombox. How does it work? Turn the Thumper on and press "play" on any mobile device or laptop - which is connected via an included audio (mini-jack) cable. Most Thumpers come with volume bass and treble controls mounted on the side. And some of them have built in Bluetooth™. They can be recharged after around 8 hours of playtime using the included battery charger.