SmartBB(TM)Hi-Fi Bluetooth Speaker Portable Mini Wireless Speaker Support Hands-free Function TF Card With this device, you no longer have to have headphone wires in the way of listening to music from your portable devices at home or outdoor. Simply turn on your Bluetooth and pair the devices, and in no time at all you have a portable speaker that sounds great. Also, if your device does not have Bluetooth don??t worry! Included on this device is a 3.5mm jack that allows you to plug in any device and have it play through the speaker. Even more, you can ply music by TF card ONLY. Super Bass Speaker; Built-in lithium battery; With micro SD TF card slot, you can play mp3 / mp4 format files in the TF card; Support A2DP, AVRCP, handsfree profile; Mini Bluetooth stereo speaker system; Saves you from the hassle of tangled wires; How to phone or receive a call When you need to call someone, dial the number on your phone directly(it will choose the bluetooth speaker as the audio source if you do not pick others for 2 seconds).2When coming a call, you can only receive it on your phone, or short press the "answer key" button to receive it, then you may hear others by this speaker and talk with others with the MIC on the speaker, no need to hand the phone. If you want to reject a call, long press the answer key button. If you need to connect to this speaker,Three kinds of playback mode: firstly by bluetooth mode,one key open and into pairing , Seondly TF card speaker , third you use a 3.5mm cable to play music on this speaker High-density seamless steel case material, Processing CNC Polishing, electroplating gunmetal black, Mirror face, 1.5 inch 3.2W super bass,loudspeaker diaphragm handfree, 3.5mm Audio in, play music 6 hours