iClever Bluetooth Wireless Sport Earbuds Headphones with Mic, Support AptX and NFC Technology Advanced Bluetooth 4.0 technology with APTX codec Built-in microphone and easy to use music controls; Support hands-free calling and answering function Built-in rechargeable battery ensures comfortable long-term use and reliable performance NFC function (as per your option) makes connection much easier and more convenient Reliable and friendly customer service ready to respond within a 24 hour time frame. 30-Day Money Back Guarantee, 12 Month Replacement Warranty and Lifetime Support Guarantee