Artis BT33 Outdoor Bluetooth Speaker with USB/FM/TF Card Reader/AUX in/Mic in (Black) BT33 is a Outdoor Bluetooth Speaker . Additionally this speaker also has the extra features of a USB port through which you can play your music by connecting a Pen Drive, an Aux in slot to connect various other media devices, TF card reader with audio Playback & FM radio. It can be used for outdoor activities, advertising campaigns and recreational activities.