JBL Endurance Peak II - Waterproof True Wireless In-Ear Sport Headphones - BlackJBL Endurance Peak II Waterproof True Wireless In Ear Sport Headphones, Black version. Features: JBL Pure Bass sound gives you enough bass to give your whole body a boost and get that extra push right when you need it the most. With 30 hours of playback (6 hours in buds 24 hours in case), youve got the extra inspiration it takes to make you go that extra mile. The Endurance Peak II Powerhook design lets you adjust the headphone to your size and