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Black key-shaped USB device with a keyring attachment.
Illustration showing a smartphone connected to a TV, indicating screen mirroring capabilities.
Black HDMI connector plugged into a smartphone's charging port.
Black USB-C key with a sleek design and a logo on the side.
Black rectangular device with a logo, featuring a USB port and a small opening on one side.
Black key-shaped USB device with a keyring attachment.
Black HDMI connector plugged into a smartphone's charging port.
Illustration showing a smartphone connected to a TV, indicating screen mirroring capabilities.
Black USB-C key with a sleek design and a logo on the side.
Black rectangular device with a logo, featuring a USB port and a small opening on one side.

MCON Key Cast

Cast a phone to the big screen

4.7
Rated 4.7 out of 5 stars
13 Reviews

Big-screen gaming that lives on your keychain.

Key Cast casts your phone to any HDMI display in seconds at 4K/60Hz, then folds down pocket-sized and clips to your keyring, popping open with a press. Built-in 2.4GHz chip for lower latency, higher poll rate, and more range, no pairing needed.

USB-C to HDMI. (HDMI cable not included.)

Color: Night
Regular price $29.99 $27.99
Free Shipping $79+ | 1 Year Extended Warranty
Will it work with my phone?
If your phone has a USB-C port that supports video-out, yes. It plays nice with most modern devices and HDMI displays (heads up: iPhone Air and iPhone 16e don't support HDMI casting, so blame Apple, not us).
What else do I need to buy to make it work?
We supply the Key Cast and the keyring. You'll just need to bring your own HDMI cable to connect it to the TV or monitor.
Will it fit on my keychain?
Yes, and it comes with an integrated keyring. When you're ready to game, a quick dual-side pinch releases it instantly, no need to fish it out of a bag.
Does it require its own battery or charger?
Nope. Key Cast is completely battery-free. It draws a tiny amount of juice directly from your phone's USB-C port, so it's always ready to plug-and-play.
How does it handle controller lag?
Key Cast packs a built-in 2.4GHz chip that directly links your phone and MCON controller. You get a stronger connection, way less latency, and a higher polling rate. Though, most people are totally fine with regular Bluetooth.
What does the MCON Key Cast actually do?
It's a pocket-sized dongle that turns any TV into a monitor. Plug it into your phone, run an HDMI cable to the TV, and instantly mirror your games in crisp 4K at 60Hz.

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Black adapter plugged into a phone's port with an HDMI cable attached, phone and backdrop showing a pipe-and-bird game

go big

anywhere

Game on any screen in seconds. Plug Key Cast into your phone, then plug an in HDMI cable. Boom, now you can play Flappy Bird in 4K.

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Black rectangular Key Cast device with an M logo on a metal key ring alongside three keys, floating on white

moves

with you

Just like MCON, Key Cast is ultra portable and designed to go everywhere with you. Maximum functionality, minimum bulk.

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4.7
Rated 4.7 out of 5 stars
Based on 13 reviews
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13 reviews
  • Rated 5 out of 5 stars
    Sep 19, 2026
    Amazing

    Very easy setup

    ML
    Micheal L.
    Verified Buyer
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  • Rated 5 out of 5 stars
    Jul 13, 2026
    Love this thing

    I travel ALOT and it makes it easy for me to use at any hotel!

    JG
    James G. G.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    Jun 27, 2026
    I LIKE IT

    I tried streaming Halo on GeForce Now, and the audio somehow didn't show up on the TV but on the phone, lol.

    MM
    Michael M.
    Verified Buyer
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  • Rated 5 out of 5 stars
    Jun 6, 2026
    Amazing

    It was great! Works so smoothly

    NM
    Nicholas M.
    Verified Buyer
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  • Rated 4 out of 5 stars
    May 18, 2026
    Cool little guy!!

    This thing is pretty neat. It’s nice not having to carry the MCON dock around in your bag if you plan to cast your phone while on the go. But you better make sure you have a full battery and an hdmi cable

    CB
    Cody B.
    Verified Buyer
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  • Rated 5 out of 5 stars
    May 11, 2026
    Very smooth connection

    Best connector I’ve come across

    LL
    Leon L.
    Verified Buyer
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  • Rated 5 out of 5 stars
    Apr 30, 2026
    Nice

    This is really nice to have anytime when you need it.

    MP
    Michael P. E.
    Verified Buyer
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  • Rated 5 out of 5 stars
    Mar 22, 2026
    Fantastic

    Nice little portable adaptor, also works perfect.

    TC
    Terrance C.
    Verified Buyer
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  • Rated 5 out of 5 stars
    Mar 8, 2026
    👏 Awesome

    This thing worked immediately after plugging it into the big screen and it’s so cool to play with fam and friends. Love it!

    CR
    Chris R.
    Verified Buyer
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  • Rated 4 out of 5 stars
    Feb 28, 2026
    Almost Perfect

    This adapter works on many different types and brands of screens when other adapters do not.

    My only complaint is that the connection to my iPhone 17 pro can be spotty if the adapter is nudged at all. It has to be in juuuust the perfect spot otherwise it looses connection and not the screen may not come back until I unplug it and plug it back in.

    JW
    Joshua W.
    Verified Buyer
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