KEEDA&reg; Wireless Handfree Headphone Built-in Microphone Headset Earphone for Iphone 6 5 5c 5s 4s, Samsung Galaxy S6 S5 S4 Note 4 Note 3 and Other Android Cell Phones (Green) Portable back-hang design, microphone handsfree for sports Heavy bass effect Built-in lithium battery (Charge via USB) Built-in microphone for handsfree cell phone use Transmission range: 10m