ActionPie VJJB-V1 High Resolution Heavy Bass in-Ear Headphones (001) Bluetooth 4.0 Stereo Headphones- Advanced Bluetooth CSR version 4.0 Latest technology. Built-in microphone Allows clear Phone communication; Enables use as a headset. Music and phone controls ensure ease of useBuilt-in rechargeable lithium-polymer battery HiFi - Best Audio Performance - Stereo - Sports - Wireless Bluetooth 33 feet distance - Over the head Foldable headphones for easy storage and transport - Passive canceling noise extremely comfortable in your ears and over your head 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