Havit Rechargeable Multimedia Woofer Speakers with Bluetooth + Card Reader + FM Radio – HV-SF5626BT: This super-bass amplifier woofer with high quality sound is perfect for indoor and outdoor usage. Audio source can be paired with TV set, LCD monitor, DVD player or any Bluetooth enabled device. It is built with a rechargeable 2,200 mAh lithium battery of 2.5 Hours working time. It can be controlled with the remote. Elasticity and powerful bass make the music express better.