Mini Bluetooth Speaker, aluminum material with microphone 3 Year Warranty By Kcrtek,Hands Free and Rechargable Battery,Support Tf Function Works for Smart Phones and tablet PC KCRTEK 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 Kcrtek Portable Wireless Speakers 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 Bluetooth Mini speaker with hands free function ,Build in microphone on the speaker.