This Anker Bluetooth SoundCore speaker plays all day and night from a single charge. It delivers crisp, stunning sound from a wireless range of sixty-six feet. Water resistant and with a built-in microphone, this little blue speaker is a sound powerhouse. Portable and sturdy, take it with you wherever you go, wherever you want your music to be heard. Size Isn’t Everything: A customized driver, passive radiator, and exclusive BassUp technology produce sound with brilliant clarity and deep bass.