It supports GSM worldwide and CDMA in Japan. Regardless of carrier support, all iPhone SE (2nd Gen) models have a 4.7" (diagonal) widescreen multitouch "True Tone" LED-backlit 1334x750 native resolution "Retina HD" display (326 ppi, 625 cd/m2) and a taptic-engine powered solid state "clickless" Home button.
It has dual cameras -- a rear 12-megapixel 4K camera with optical image stabilization, a f/1.8 aperture, a 6-element lens and wide color capture -- as well as a front 7-megapixel "FaceTime HD" camera with support for 1080p video. The cameras support motion tracking and offer augmented reality support, too.
The iPhone SE (2nd Gen) uses an "aerospace-grade" aluminum alloy case reinforced by steel and has a glass front and back. It is splash, water, and dust-resistant (IP67), but not water-proof, and it has stereo speakers and a Lightning port. It has three color options -- white, black, and (PRODUCT) RED. Internally, the iPhone SE (2nd Gen) is powered by a 64-bit, 7 nm 2.66 GHz "Apple A13 Bionic" processor with six cores -- two performance cores and four high-efficiency cores -- and a "third-generation Neural Engine." It has 3 GB of RAM and 64 GB, 128 GB, or 256 GB of flash storage (256 GB option discontinued September 14, 2021; all options discontinued March 8, 2022). It also supports 802.11ax Wi-Fi 6 with 2x2 MIMO, Gigabit-class LTE with 2x2 MIMO, Bluetooth 5.0, NFC for Apple Pay, "Express Cards with power reserve" for compatible transit systems, and dual SIMs (one hardware nano SIM and one software-based eSIM).