Bluetooth V4.1 Headphones,HAVIT HV-H926BT Wireless Stereo Sport Headsets for iPhone and Enabled Bluetooth Cell Phones (Black+Sliver) Fashion Streamline Outlook and Comfortable Design Ensure A Fashionable and Perfect Experience. HD Sound Quality Rich Stereo Microphone/Listening Sound Wirelessly with Airoha Bluetooth 4.1 Tech. Only 16.6g, Four Different Size Replaceable Rubber Ears Caps, Standby Time: Up to 250 hours, Music & Play Time: About 5 hoBehind-Ear Ergonomics Design Stable when Exercise, Running, Climbing, Driving, Skating, Camping, Fishing and other Outdoor Sports. Multipoint: Supports 2 phones Connect at the Same Time, but some functions maybe limited Behind-Ear Ergonomics Design Stable when Exercise, Running, Climbing, Driving, Skating, Camping, Fishing and other Outdoor Sports.