Slate gray and quiet about it. The AiroPro uses gentle haptic vibration instead of flashing lights, so your session stays low-key. The body is aluminum alloy with an ergonomic shape, and Airo pods attach with a magnetic connection, so swapping strains takes a second. It's a closed-loop system, with hardware and oil designed to work together. Charge it over USB-C. Wipe the magnetic contacts with a dry cloth now and then to keep the connection strong.