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

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