Features: Easy-to-use and easy-to-carry 1.5 lb. speaker puts out great sound wherever you take it Cylindrical design creates an enjoyable listening experience in a 360-degree pattern Aluminum body has an IPX4 rating for exceptional resistance to impact, dust, and water Near Field Communication allows button-less Bluetooth pairing with your NFC-enabled device USB charging port keeps your smartphone or tablet juiced up while you're listening to music Bose Connect app or Party Mode lets you link a second SoundLink unit for even better sound Rechargeable lithium-ion battery provides up to 12 hours of playback Made to fit Bose SoundLink Revolve Bluetooth Speaker with Charging Cradle Material: EVA , Color: Black , Internal size: 10.5 x 4.5 x 4 inch