Antigravity Batteries AG-TB-01 Thump Box Bluetooth Speaker The THUMP-BOX is an extremely compact (2" x 2" x 3") Bluetooth Speaker System. The patented SoundWave Technology does not have Speakers yet creates BIG sound! Sound is transmitted into the surface the THUMP-BOX is placed on: Cabinets, Tables, Cardboard Boxes, Wood Floors or any porous surface becomes your Speaker System. It also works as a Speakerphone with its built-in Mic. The THUMP-BOX has an LED Lighted Touch-Pad on top for Easy Control of Audio and Calls. THUMP-BOXES have a long-lasting lithium battery, they can be chained in multiple units, or connected directly to your phones Audio Jack. Great Sound, extremely unique and fun for the family!