PromoType's KeyBoy Advance brings a 50% HHKB layout wrapped in a Game Boy Advance‑inspired shell. Buyers can choose an anodized or e‑coated aluminium case, or a translucent PC enclosure, echoing the handheld’s classic look. The keyboard supports split spacebar options (2.25u+1u+2.75u or 3u+3u) and offers both rigid and o‑ring top mounting for customizable acoustics.

The board ships as a barebones kit, requiring users to source keycaps, switches and stabilizers. Its PCB accommodates ANSI or ISO Enter keys and comes in three flavors: a soldered MX‑compatible version at $275, a wired hot‑swap add‑on for $15, and a tri‑mode hot‑swap (wired, Bluetooth, 2.4 GHz) for $40 extra. Case upgrades cost $20 for e‑coated aluminium or $30 for PC, pushing a fully featured build to $340. All configurations are fully remappable via the open‑source VIAL utility, and shoulder bumpers include programmable micro‑switches.

Shipping is slated for Q4 2026, with the group buy running until 22 July 2026 at a 20% discount off the projected RRP. The release targets enthusiasts seeking a nostalgic aesthetic with modern wireless flexibility, potentially expanding the niche market for retro‑themed mechanical keyboards.