The Oraimo Bluetooth Obs-91d Soundful Wireless Speaker Tf Card Aux has a dual high definition speaker drive units and a 2.0 Two-Channel 360 degree surround super bass and stereo sound effect and to make you feel the shocking bass of the music.It gives extremely long standby and using timehours in which the talk time / playback time is up to 12 hours.The built-in sensitive HD microphone, handsfree supports answering incoming phone calls even when it play music or when you’re driving, it’s very convenient.It has a built-in Micro-SD Card Slot and Flash Drive Slot and a Support TF Card / Flash Drive Play Mode,  Even You Do Not Own A Device With Bluetooth Function, You can Also Insert A TF Card With Songs Downloaded To Play Music .It supports  AUX Line-out Music Play Mode,and you can also connect The Speaker To Mobile Phone Or Tablet PC To Play Music.The Oraimo wireless Bluetooth transmission would help to solve the usual long wire, short wire troubles.Product packaging with foam package makes transportation safer.