Type Ear coupling: In-ear (earbuds) Primary application: General listening Secondary application: General listening Operating principle: Closed Audio Frequency response (TX): 20Hz - 20kHz SPL: Not specified Driver diameter: 8.6 mm THD: Not specified Noise cancelling: No Comfort Weight: 16.5 g Cable Style: Not applicable Length: Not applicable Connector: Not applicable Built-in mic: YesDelivering signature JBL sound with up to 8 hours of battery life and a convenient neck clip, E25BT in-ear wireless headphones provide a comfortable and secure fit over extended periods of useYou can also seamlessly switch from music on your portable device to a call from your phone, so that you never miss a callYou’ll also appreciate the added convenience of a three-button remote and microphone for crystal clear phone conversations