It's important to know that this A2123 iPad Air (3rd Gen) model supports Gigabit-class LTE on bands 1-5, 7, 8, 11-14, 17-21, 25, 26, 28-30, 34, 38-41, 46, and 66, but not bands 42 or 71. While compatible with carriers worldwide, it is believed to have been sold primarily in the UK, Europe, Asia, and most regions outside of the US, Canada, Australia, and New Zealand.
Regardless of connectivity, the iPad Air 3rd Gen models are positioned as offering "high-end features and performance at a breakthrough price." They feature newer, faster internals than the iPad Pro 10.5" models they replaced, but have a lower-quality display, as well as inferior cameras and speakers.
All iPad Air 3rd Gen devices have a fully-laminated, antireflective 10.5-inch LED-backlit 2224x1668 (264 ppi, DCI-P3 color gamut) "Retina" display, but they do not support "ProMotion technology" and its 120 Hz refresh rate.
These models are powered by an Apple A12 Bionic processor, 3 GB of RAM, and come with either 64 GB or 256 GB of flash storage. They are available in Black and Space Gray, White and Silver, or White and Gold cases.
Other notable features include dual cameras: a rear 8-megapixel "iSight" camera for stills and 1080p HD video, and a front 7-megapixel "FaceTime HD" camera also for stills and 1080p HD video. They support dual-band 802.11a/b/g/n/ac Wi-Fi with HT80 with MIMO and Bluetooth 5.0, plus dual microphones and a single set of stereo speakers. They also have a standard 3.5 mm headphone jack and Touch ID.
Connectivity and power are provided by a Lightning port. A "Smart Connector" supports the same small Apple Smart Keyboard as the earlier 10.5" iPad Pro models. It is also compatible with the original Apple Pencil.
Battery life is rated at 10 hours of Wi-Fi web surfing, video, or music, and 9 hours on cellular data. This model has an eSIM and a nano-SIM slot.