What is the difference between this one and the $40 one https://www.amazon.com/gp/product/b00001p4zh/ref=ask_ql_qh_dp_hza

The $40 model is the classic Porta Pro. It has a different cable (90deg plug, no button/mic). This one has an updated cable with a straight plug and metal spring strain relief. It has a mic/remote as well (works really well). Other than that it's the same as the classic. Both models have the Koss Lifetime Warranty.

Why does it say it needs a battery?🤨

The Bluetooth version has a rechargeable battery but it comes with that built in. Not sure why it would say that. The wired versions do NOT need a battery if you''re looking at the Porta Pro headphones.

How good is the microphone?

The microphone works well. Better then the simple ones given with new phone earpiece.

does it come with a hard carry case?

No, it comes with a soft, leather-like pouch.

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inakustik PORTA PRO - Ultra Portable w/mic & remote, Black/Silver, One Size, 145193970

inakustik PORTA PRO - Ultra Portable w/mic & remote, Black/Silver, One Size, 145193970

Product ID: 260026852

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Details

Brand
Koss
Colour
Black
Ear placement
In Ear
Form factor
On Ear
Impedance
60 Ohm

🎤In-line mic for hands-free calls

🎛️1-touch remote for instant control

🛡️Rugged cable with spring strain relief

Description

🎧 Elevate your commute with pro-grade portability and control

COMFORT ZONE FIT - Ergonomic temporal pads provide a secure, all-day comfortable wear for busy professionals on the move.
COMPACT READY TO GO - Collapsible headband design makes these headphones ultra-portable and perfect for your dynamic lifestyle.
DURABILITY MEETS DESIGN - Rugged cable system with spring reinforced strain relief guarantees long-lasting performance.
CRYSTAL CLEAR CONVERSATIONS - Built-in in-line microphone ensures your voice is heard loud and clear, wherever you go.
EFFORTLESS CONTROL AT YOUR FINGERTIPS - Seamlessly manage calls and music with the intuitive 1-touch remote.

The inakustik PORTA PRO headphones combine ultra-portability with professional-grade features including an in-line microphone, 1-touch remote, and a rugged cable system reinforced for durability. Designed with ergonomic temporal pads and a collapsible headband, they deliver comfort and convenience for on-the-go audio experiences.

Specifications

Controller Type	Wired
Control Method	Touch
Control Type	Volume Control
Compatible Devices	Devices with a 3.5 mm audio jack or appropriate adapter
Antenna Location	Music Listening
Enclosure Material	Plastic
Water Resistance Level	Not Water Resistant
Is Electric	No
Specific Uses For Product	[INF] Communication, Travel, Sport
Cable Features	Detachable
Additional Features	Lightweight, Foldable, Microphone Feature, Universal Phone Control, iOS Phone Control
Earpiece Shape	Rounded/Cushioned
Headphones Ear Placement	On Ear
Headphone Folding Features	On Ear
Frequency Range	15-25,000 Hz
Impedance	60 Ohm
Noise Control	None
Audio Driver Type	Dynamic Driver
Connectivity Technology	Wired
Wireless Technology	RF
Headphone Jack	3.5 mm Jack
Color	Black
Style Name	Porta ProWith Mic
Theme	Music
Item Weight	0.02 Kilograms
Unit Count	1 Count