Closed dynamic headphones. ULT button to boost your bass. The Energy Core easily fits in your pocket, purse or bag for wherever you may take it. Great for travel and long camping trips too! The perfect iPhone charger, Samsung charger, Smartphone charger and more! Integrating a powerful 10,000 mAh rechargeable battery pack and 2 full USB-A output ports for charging virtually any device. The PhoneSuit Energy Core LCD PD Battery Pack provides the high capacity battery power you need to charge all of your Smartphones and mobile devices when on the go.