JTD Bluetooth Mini Lightweight Wireless Stereo Sports/running & Gym/exercise Bluetooth Earbuds Headphones Headsets W/microphone for Iphone 5s 5c 4s 4, Ipad 2 3 4 New Ipad, Ipod, Android, Samsung Galaxy, Smart Phones Bluetooth Devices--2015 Newest Version (light green) The headphones are equipped with Bluetooth 4.0 + EDR alongside a 33ft working distance, meaning unparalleled functionality in headphones 60% smaller than the competitors. Can connect with 2 Bluetooth cell phones at the same time. Can pick up or cancel phone calls by long push the MFB. Well connect with Bluetooth appliance in 10 meters. Built-in battery can last 150 hours, and 4-6 hours for talking, and charging time is only 1.5 hours JTD Wireless Bluetooth Headphones gives customers lifetime technical support from the manufacture and free 1 Year Manufacturer Warranty from J-Tech Digital