The RUNderground AthleTecs &ndash; Bone Conduction Wireless Bluetooth Sport Headphones With Power Bank Included For Extended Use On The Go Imagine listening to your favorite music and still being able to hear what is going on around you. Sounds travel through your cheek straight to inner ear, bypassing the eardrum. This will provide a safer workout and eliminates potential hearing damage. Ergonomic design delivers a tailor-made fit, allowing for hours of continuous use. Lightweight construction in rear prevents annoying bouncing, keeping headphones firmly in place. This headset is so comfortable, you will forget you are wearing it! Earphones talk to you! Voice prompts make setup and use a piece of cake. Bluetooth V4.0 links effortlessly to most devices, allowing you to enjoy online music such as Pandora and SoundCloud, while never missing an important call, text or notification. Controls on the unit allow you to increase/decrease volume, skip/rewind tracks, answer/end calls, redial & call waiting. Dual microphones projects your voice clearly & provides accurate voice texting. Sweat Defender protects against perspiration and rain. No power source...No problem! These headphones come with an external Power Bank that will fully charge your headset on the go should you use up the 6 hours of ample playback time. The Power Bank is also equipped with a bright LED flashlight.