Noise cancellation with custom filters provide the peace and quiet you need wherever you go. Up to 5 hours playback with an additional 10 hours with case. Clear call quality with 4 microphone design. IPX4 water-resistant and sweatproof for active use. Complies with CPSIA, Prop 65. 1.21″ W x 1.75″ H x 2.53″ L