Sharper Image SBT1008 Bluetooth Wireless Tailgate Speaker With Built-in Amplifier And Guitar Jack. Bluetooth Tailgate Speaker Amplifier speaker features wheels and a retractable handle for convenient portability Connect via Bluetooth; USB port; SD slot; aux-in port Includes wireless microphone Total output of 50W Rechargeable battery (4500mAh) Control knobs affect volume, bass, treble, microphone, echo Buttons on speaker include repeat, next, play/pause and input mode Five Equalizers Support Wireless Microphone (included. BLACK.