The innovative recharge box comes with a built-in 3350mAh high-density lithium battery that recharges your earbuds for over 40 times. It also charges your phone too! As as premium choice. TaoTronics Earbuds are a perfect choice for your customers that expose your brand thousands of times exclusively no matter if your customer is on the go, in the gym, or at home. Over 3 hours of playtime on a full charge. 3350mAh charge box recharge the ear buds up to 40 times.