Bluetooth 4.0 Stereo Headphones- Advanced Bluetooth CSR version 4.0 Latest technology.</br>Built-in microphone Allows clear Phone communication; Enables use as a headset. Music and phone controls ensure ease of use，Built-in rechargeable lithium-polymer battery</br>HiFi - Best Audio Performance - Stereo - Sports - Wireless Bluetooth 33 feet distance - Over the head</br>Foldable headphones for easy storage and transport - Passive canceling noise extremely comfortable in your ears and over your head</br>Built-in rechargeable lithium-polymer battery With Li-battery enables up to 9-10hours of talk time or audio playback, Standby time up to 180 hours.3.5 mm AUX line in - Allow music playback from various sources even when not charged</br></br>Product Description</br></br>Listen to your favorite tunes with the wireless headphones designed with the latest Bluetooth 4.0 technology. This multifunctional pair of headphones will deliver amazing sound quality and lasting comfort. Featuring a lithium ion battery that will give you up to 10 hours of uninterrupted playtime.headphones also makes it an excellent travel companion. The headphones come with their own hard travel case.</br><br/>http://www.amazon.com/gp/product/B018ZDXOD8