how does the "touch" mechanism work? its so tiny. theres no button. i dont even see room for a button

Yes I thought the same thing. There is no mechanical button. There is a tiny light with a small sensor that recognizes contact. Your not actually pushing so much as lightly touching. I’ve been using mine for about a year now and trust me it does really work.

Most accounts that allow these typically also require a less secure backup option if you lose your key. So can't hackers just bypass the Yubikey?

There's usually an option to use something besides the yubikey, however, I would hope you've picked out another password that's as strong as you can get it. Or, on the other side you could get another yubikey and register both of them. I actually have two keys and a nano. One key for the wife and the nano for my main pc, the third is around my neck on a stout cord.

Description says "designed to stay in the port so you can stay connected and secure anywhere." So if my laptop is stolen then so is my security key?

Two answers -- the technical answer, and the practical one: Technical: Your security key would be stolen. At that point, you would use a backup method to connect to your accounts (from another computer) and you would disable your lost YubiKey as a valid MFA/2FA method. Practical: I believe the spirit of the original question is more around "if my laptop is stolen, and my YubiKey is in it, can't the thief access my secured accounts?". And, the answer to that is "technically, if the laptop thief also knows your account password, they would be able to use the YubiKey and get past the second factor of authentication when logging in". In all likelihood though, the thief just wants your laptop hardware. The YubiKey purpose is really to protect your accounts from being logged into by a nefarious hacker, online somewhere around the world who somehow has your compromised username/password combination. The likelihood that the laptop thief and the online hacker are collaborating is pretty low unless you are an international spy, dignitary, billionaire, or other "high value target". But if that describes you and you use a laptop, best to try one of the more removable YubiKey options.

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🔐 Stay one step ahead with the tiniest titan of online security!

BUILT TO ENDURE - Engineered to resist tampering, water, and crushing—security that lasts through your busiest days.
POCKET SIZED POWERHOUSE - Nano form factor fits discreetly in your USB-A port—stay secure without bulk or fuss.
EFFORTLESS ONE TAP ACCESS - Just insert and tap to authenticate instantly—no passwords, no delays, pure convenience.
UNRIVALED SECURITY SHIELD - Protect your digital life with industry-leading 2FA that blocks phishing & account takeovers.
SEAMLESS UNIVERSAL COMPATIBILITY - Works flawlessly across Windows, macOS, Linux, ChromeOS, and all FIDO-compliant apps.

The Yubico YubiKey 5 Nano is a FIDO-certified, ultra-compact USB-A security key that delivers robust two-factor authentication for seamless protection across hundreds of online services. Designed for professionals who demand both convenience and top-tier security, it offers tamper-proof, water-resistant, and crush-resistant durability in a discreet form factor that stays plugged in for instant, one-tap access.

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Model Name	YubiKey 5 Nano
Product Dimensions	0.51"D x 0.47"W x 0.12"H
Flash Memory Type	USB
Manufacturer	Yubico
Hardware Connectivity Technology	USB Type A
Global Trade Identification Number	05060408461457
Hard Drive	1 GB
Item model number	Y-240_SML
Hardware Platform	Laptop, Desktop, Windows, macOS, ChromeOS, Linux
Item Weight	0.2 ounces
Item Dimensions LxWxH	0.51 x 0.47 x 0.12 inches
ASIN	B07HBDX2CM
Is Discontinued By Manufacturer	No
Date First Available	January 21, 2021

YubicoYubiKey 5 Nano - Two-factor authentication (2FA) security key, connect via USB-A, compact size, FIDO certified - Protect your online accounts

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