Unmatched sound for its size. The smallest portable speaker from Bose delivers crisp, balanced sound and deep bass from a tiny design.Tear-resistant silicone strap. Attach it to your backpack or cooler and bring it wherever you go, Waterproof and rugged. Meets IPX7 standards; plus resists dents, cracks and scratches thanks to the premium materials and a soft, rugged exterior, 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 6 hours of play time.