Sennheiser HD 450BT Headphones (Wireless, Black)

Weight and dimensions Product weight: 238 g Working conditions Temperature range (storage): -20 - 60 °C Temperature range (operation): 0 - 40 °C Efficiency Product color: Black LEDs: Yes Control Type: Buttons Built-in switch: Yes Cable color: Black Operating buttons Answering/ending calls Volume - Volume + Bluetooth pairing Headset type: Stereo Detachable cable: Yes Volume control: Button Foldable: Yes Wearing style: Headband Product type: Headset Control type: On-ear Application: Calls/Music Maximum sound pressure level: 108 dB Package contents Wires USB Type-C to USB Type-A Sound (2ˌ5 mm to 3ˌ5 mm) Quick Start Guide: Yes Suitcase: Yes Safety Sheet: Yes Ports and interfaces Bluetooth: Yes Frequency band: 2.402 - 2.480 GHz Connectivity: Wired and wireless Bluetooth profiles HFP A2DP SBC AAC AVRCP HSP USB connection: Yes USB connector: USB Type-C Bluetooth version: 5.0 Battery Battery voltage: 3.7 V Supported battery type: Built-in Battery type: Lithium Polymer (LiPo) Battery capacity: 600 mAh Charging source: USB Music playback time: 30 h Charging time: 2 hours Battery powered: Yes Other functions 2.5mm connector: Yes Microphone Microphone Direction Type: Omnidirectional Microphone frequency: 80 - 6000 Hz MEMS (Micro-Electro-Mechanical System) microphone: Yes Number of built-in microphones: 2 Microphone type: Built-in microphone Headphones Driver Type: Dynamic Headphone construction: Circumaural Total harmonic distortion: 0.3% Frequency response: 18 - 22000 Hz Noise reduction type: Active Speaker diameter: 3.2 cm Noise Cancellation: Yes Impedance: 35 Ω