What is the difference between active noise cancelling and passive isolation?

Passive isolation is just the shape of the headphone: in-ear tips or over-ear pads physically block sound. Active noise cancelling (ANC) also listens to your surroundings through microphones and generates an opposing wave, so it works best on steady drone — a plane, a bus, ventilation. ANC does very little against sudden sounds such as speech.

How long do wireless earbuds really last on one charge?

In-ear buds usually play for 4–8 hours, and the case adds another two to four full charges. Over-ear headphones last 20–40 hours. High volume, ANC and cold weather all cut into that — in winter expect roughly a fifth less.

Can I use one pair with both my phone and my computer?

Yes, if the headphones support multipoint: they stay connected to two devices at once and switch by themselves when a call starts on the computer. Without multipoint you have to disconnect one device manually every time.

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Sennheiser E 835-S - vocal, dynamic, cardioid microphone with on-off switch

Name: Sennheiser E 835-S - vocal, dynamic, cardioid microphone with on-off switch
Brand: Sennheiser
SKU: 7020798
Price: 90.99 EUR
Availability: OutOfStock

SKU: 4006087045145

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Technical Specifications

Product height: 18 cm
Connectivity: Wired
Microphone directionality: Cardioid
Weight: 330 g
Safety warnings: Do not expose the device to moisture or water., Do not disassemble the unit yourself.
Package contents: Microphone, Cover, Microphone holder
Microphone type: Dynamic