Bass delivers punchy low end. Up to 18 hours of playtime for all day listening. Three mics support Alexa voice assistant control and clear calls. Bluetooth 5.1 supports a better connection that uses less energy. Supports Microsoft Swift Pair and Google Fast Pair. IP67 Rated dust and waterproof. Multipoint - connect up to 2 devices. Bang & Olufsen app. Durable aluminum shell with water repellent leather strap. Recommended room size: 50-300 square feet. Speaker: 1 x 3.5" woofer 1 x 3/5" tweeter. Power supply: 5V DC 3A. Includes USB-C to USB-A cable.