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

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