Built-in high-quality dual voice coil speakers, bright treble, alto mellow, deep bass, bringing you the perfect music to enjoy.Full, High-Definition Sound - Enjoy an impressively crystal clear sound quality and robust bass realized through dual high-performance drivers and passive subwoofer.High capacity rechargeable 500mAh battery for up to 5 hours of playtime based on music volume.Perfect for students in dorms, partygoers at celebrations, families at special events, and children for relaxing. Especially ideal as holiday GIFT, birthday present, housewarming gift or simply as a personal treat.Enjoy a High Definition stereo sound with a impressive volume whether you're lounging around the house,or partying,walking out,camping,hiking,biking.