Portable Mini Bluetooth Wireless Metal Speaker ,Rechargable Battery Support Green Color KCRTEK Wireless mini Bluetooth Speaker 120 days no reason to return ,money back 100%.our fan-favorite 18-month warranty and friendly customer service. The aviation grade aluminum material,sanding BY CNC machining, the envy at first looks like a artwork.Whether you're on the go or relaxing at home, the convenience of these great Mini Bluetooth speakers will bring satisfaction to your ears that can be used anywhere and anytime with any Bluetooth enabled device Build in Mp3 player included, it could automatically play the music with a stand alone Micro SD card. (Micro SD not included in the package) Built-in Li-Ion Rechargeable Battery-Built-in microphone for hands-free speaker phone calling Easy to pair (Charger head not included in the package) Getting a call while listening to the music,The Wireless Mini bluetooth speaker with hands free function ,Build in microphone on the speaker.