Dual Trumpet in Each Earbud, Bluetooth V4.1 Wireless Sports Headphone, Memory Steel Wire Stereo Bluetooth Headset with Microphone, Compatible With Digital Equipment with Bluetooth Unique transparent cover design with noise reduction function, you can see clearly the materials in the headset(only the earbud part), fashionable and reliable Bluetooth V4.1 wireless headset: The latest technology of Bluetooth and backward compatibility V3.0, V2,1 V2.0 and so on 85 mAh capacity of rechargeable battery, about 2 hours charging time, about 4 hours music time Stable signal transmission, barrier-free 10 meters transmission distance(depend on the environment) In order to fit your ears, memory steel wire can be bended in different shapes. Mini and portable sizevery light and convenient never bother your space