301 Bluetooth Speaker With Karaoke. Bluetooth Speaker System. Enjoy Wireless Music Streaming With Built-In Bluetooth. Listen To Even More Of Your Favorite Digital Audio Files With The Micro-Sd Card And Usb Flash Drive Readers. Additional Features Of Includes , Input, Play Bt/ Usb/Aux /Tf Card In The Mp3 Audio File , Stereo Surround Sound External Charging By Micro Usb Port, So Loud. With Its Two Specially Angled Speaker Drivers, This Indoor-Outdoor Speaker Surrounds Your Party In Full-Range Stereo-Complete With Thundering Bass From The Passive Radiators. Control It From Your Device Or The Top-Mounted Bass / Treble And Volume Controls.