Deep, loud, jaw-dropping sound. Engineered to be the best-performing portable speaker from Bose, True 360° sound. Delivers consistent, uniform coverage, Seamless aluminum body. Provides durability and water resistance (IPX4), Speakerphone. Built-in microphone for taking calls and accessing your phone’s Siri or your Google Assistant™ from the speaker, Rechargeable lithium-ion battery. Lets you enjoy up to 16 hours of play time.