The iPhone SE, which Apple announced on Monday, is basically the components of Apple's latest line of 6s phones packed into the older body of an iPhone 5s.
But not all of those components are the latest and greatest — Apple is actually using its first-generation fingerprint sensor in the iPhone SE, not the latest version that you'd find on the 6s line of phones.
It's the same fingerprint sensor that you find in the 5s and the iPhone 6 and 6 Plus phones.
That means that Touch ID on the iPhone SE is a bit slower to react than the sensor on the larger, flagship 6S phones that Apple announced last fall.
(The Touch ID fingerprint sensor on the 6S line of iPhones is so fast that it takes some getting used to — some people even think that it's too fast.)
You'll notice, however, that Touch ID on the iPhone SE is still faster than touch ID on the 5s. That's thanks to the faster A9 processor in the SE, the same chip found in the more expensive iPhone 6s line.
