[Superior sound quality]: built-in 45 mm 10 W drivers produce crystal clear sound and strong bass without distortion even at the highest volume. Creates an immersive listening experience.[Good compatibility]: this wireless speaker is compatible with wireless audio streaming and works with devices such as iPhone, Android mobile phone, iPad, tablet, PC. Ideal for personal indoor or outdoor use.[Multifunction playback]: TF card / Bluetooth / AUX-IN connection audio cable playback to make more daily decisions, can give you a variety of alternative status and become your daily music assistant.[Long service time]: built-in 300 mAh rechargeable lithium battery, provides up to 4 hours working time, perfect for home, party, picnic, travel.Full charge takes only about 2 hours.[Portable and convenient]:lightweight and small. Portable size with cord makes it convenient to take anywhere for party, picnic, hiking, camping, driving, fishing and ect. No problem with it hanging on its strap.