Jaybird FREEDOM 2 In-Ear Wireless Bluetooth Sport Headphones with SpeedFit - Tough All-Metal Design - Carbon – Used Very Good

Secure-fit - you don’t have to Think about your ultra-small buds staying in while you run, no matter how hard you run
Speedfit - switch to an Under-Ear fit in Seconds for easy access to the mic when a call comes in
Sweat-proof - Double hydrophobic nano coated, sweat is a part of your routine, and freedom 2S sweat-proofing technology stands up to every drop of sweat you dish out
Custom sound - pump up the bass - freedom 2 works with the Jaybird app to give you your music, your way with drop-free Bluetooth signal strength
8 hours in your pocket - you can run for hours without worrying about your battery life.Impedance: 16 Ohm