SpecificationsActive noise cancelling for silencing noisy city traffic, cabin noise or a busy office Bluetooth connection.Mic for calls, smart talk ,work with all iPhone models and other smartphones. Featuring independent on-board controls, manage tracks and receive callsConnect wireless or via 3.5 mm audio cable Bluetooth v 4.0 Bluetooth solution: CSR8635Bluetooth profile  Operating distance:10M Rechargeable battery Li-ion polymer.Battery 290 mAh Music playback and talking time: 18 hours Charging time: 3 hours ANC working time: up to 8 hoursNoise reduction performance: up to 18dB Driver unit 40mm Dynamic driver, N40 neodymium magnet.Frequency Response:  20KHz Sensitivity 105dB Impedance 32 Ohms Power: 10 mW Suitable for all devices.High school bass very balanced and layered, high fidelity. High quality ear pad generate with rich ,full sound Adjustable fit Hyper bassUltra light: 16,60 grams (with cord and battery)