Adam Neckband Headphones must be a great promotion for your next promotional event! The Sport Magnetic Headphones with Mic and build in recharger battery with 90 mAh capacity,battery life up to 4 hours playtime.Compatible with Android and iOS device!With an ergonomic in-ear design made it perfect for sport,and the built-in magnet gives this around the neck Bluetooth headphones a convenient storage way to carry around when your earbuds not in use. Suitable for gym, working out and running.