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

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