Intcrown S520 Wireless Bluetooth Headphones Sport Earbuds for running With Microphone With Noise Cancelling Intcrown S520 Wireless Bluetooth Headphones especially designed to offer you the best experience of enjoy music while you are doing sports,which are equipped with CSR Bluetooth V4.0 +EDL and DSP Noise cancellation technology. It's really excellent that the earphones will stay in your ears comfirtable due to its diminutive size, which maybe the smallest size within the similar products, in data as 60% lighter than the competition. It's perfect for sports, such as running with. They have all the features you need: Mini Size, Super light weight,decent sound quality,the chord is just the right length, easy to connect to Bluetooth, enable hands free talking, in a word, you get a full range on motion with your head while maintaining good sound quality and pain free experience. 4 hours working time and one hour recharge time, 10 meters working distance. Package contents: Intcrown S520 Wireless Bluetooth Headphones, usermanual, USB charging cable, and earbuds replacement. They are all in one gift standard box, which makes Intcrown S520 to be a good gift choice.