It features an aluminum unibody while retaining Nothing's retro-clear hardware design touches, with a clear, redesigned camera unit. Yes, the aggressively protruding circular camera unit of the Phone 3a Pro is gone, replaced with an oblong housing that houses the triple-camera array and a tweaked Glyph Matrix, similar to what debuted on last year's Nothing Phone 3.
The Nothing Phone (4a) Pro drops (3a)'s plastic frame and brings a metal unibody design. It's also slimmer at 7.95mm (down from 8.4mm) but weighs the same (despite using metal instead of plastic). The phone is rated IP65 - Nothing couldn't quite hit the requirements for IP67, so it claims that the phone can survive submersion down to 25cm for 20 minutes.