Come and Check Our Promo Solutions.The charging case with built-in 10000mAh battery could recharge the earbuds about 30 times, gives up to100 hours continuous music time. It can also be used as a power bank in an emergency. The wireless earphones provides you with the most realistic,clear sound and powerful bass performance,making you feel as if you were at an idol concert site. Smart digital screen shows remaining power in digital format. Perfect for running, hiking, yoga, exercises, gym, fitness, travelling and etc. Pls check inventory and detailed info with us before placing your orders.