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

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