Outdoor Bluetooth Waterproof Speaker, 54MM Loud Speaker, NFC Bluetooth Speaker, Hands Free Portable Speaker, Unique Design Speaker, 6 Hours of Playtime for All Kinds of Sports Activities 54MM loud speaker for excellent bass and high-definition sound quality. • Built-in NFC function for fast and easy connection. • Unique and fashionable design makes even more fun with all kinds of sports activities. • Water resistant speaker with built-in mic, suitable for outdoor use. • 6 hours of playback time, 10M transmission range, can work with all enabled device, such as iPhone, iPad, tablets, smartphone, etc.