Konstar Bluetooth Speaker with Enhanced Bass Loud and Clear Sound,Stereo Portable Wireless Speaker Support usb/tf card,Built-in HD Mic,Up to 12 Hours Playing Time(Black) Superior Sound Quality:Advanced digital sound,noise/wind reduction technology,and unique loudspeaker cavity structure to deliver premium acoustic sound,crystal clear balanced bass Incredible Battery Life:Built-in high capacity rechargeable Li-ion battery(4000mAh), supports up to12 hours playing time at the volume to 70% of the maximum volume Bluetooth 4.0 Technology: Compatible with all Bluetooth-enabled devices. Instantly connect to your Iphone/Ipad or tablet from up to 10m away. SoundCore reconnects automatically to the last device used. Built-in micphone for hands-free calls. so you can conveniently pick up a call by this bluetooth speaker With TF Card Slot, You Can Play the Mp3 Format Music Which Storaged in Tf Card. What you get: Konstar Wireless portable speaker, Micro USB charging cable,Aux in cable,user manual and friendly customer service, and 30-day money back guarantee