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

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