Sennheiser HD 450BT Wireless Headphones Head-band Music Bluetooth Black

Weight: 238 g | Quick start guide: Yes | Bluetooth: Yes | Cables included: Audio (2.5mm to 3.5mm) | Frequency band: 2.402 - 2.480 GHz | Operating temperature (T-T): 0 - 40 °C | Cables included: USB Type-C to USB Type-A | Product colour: Black | Battery voltage: 3.7 V | LED indicators: Yes | Battery type: Built-in battery | Connectivity technology: Wired & Wireless | Storage temperature (T-T): -20 - 60 °C | Bluetooth version: 5.0 | On/off switch: Yes | Noise canceling type: Active | Driver type: Dynamic | Wearing style: Head-band | Microphone frequency: 80 - 6000 Hz | USB connectivity: Yes | USB connector: USB Type-C | Bluetooth profiles: A2DP | Bluetooth profiles: SBC | Bluetooth profiles: AVRCP | Foldable: Yes | Bluetooth profiles: AAC | Bluetooth profiles: HSP | Bluetooth profiles: HFP | Carrying case: Yes | Cable colour: Black | Driver unit: 3.2 cm | Safety sheet: Yes | Ear coupling: Circumaural | Recommended usage: Calls/Music | Operating keys: Volume + | Operating keys: Bluetooth pairing | MEMS (Micro-Electro-Mechanical System) microphone: Yes | 2.5 mm connector: Yes | Sound pressure level (max): 108 dB | Noise canceling: Yes | Battery technology: Lithium Polymer (LiPo) | Headset type: Binaural | Impedance: 35 Ω | Detachable cable: Yes | Volume control: Button | Operating keys: Answer/end call | Battery operated: Yes | Headphone frequency: 18 - 22000 Hz | Control type: Buttons | Total Harmonic Distortion (THD): 0.3% | Product type: Headset | Battery capacity: 600 mAh | Operating keys: Volume - | Continuous audio playback time: 30 h | Microphone type: Built-in | Battery recharge time: 2 h | Number of microphones: 2 | Microphone direction type: Omnidirectional | Control unit type: On-ear control unit | Charging source: USB