GameSir and Hyperkin have announced a landmark collaboration with the reveal of the X5 Alteron, a controller that aims to rethink what mobile and multi-platform gamepads can be. Billed as the world’s first fully modular mobile gaming controller, the X5 Alteron blends Hyperkin’s deep roots in retro hardware with GameSir’s modern approach to ergonomics and wireless performance.
At a glance, the X5 Alteron already stands out thanks to its transformable design. Using GameSir’s telescopic arm system, the controller can physically change size and shape, extending up to 213mm to accommodate a wide range of devices. It supports low-latency wireless play on iPhone, iPad, Android devices, and Nintendo Switch 1 and 2, with Bluetooth connectivity also enabling PC gaming. Smooth platform switching means players can jump between devices without the usual pairing headaches.
Where the X5 Alteron truly separates itself is its modular ecosystem. Nearly every major control element can be swapped or reconfigured, allowing players to tailor the controller to specific genres or personal preferences. Thumbstick layouts can shift between symmetrical, offset, or top-stick configurations. Face buttons, D-Pads, and even entire control modules can be exchanged, turning the same controller into a fight pad, a retro throwback, or a modern twin-stick setup in minutes.
Hyperkin’s retro influence is especially evident in the specialty modules. Options inspired by classic GameCube and N64 controllers are designed with emulation and Nintendo Switch Online in mind, while a dedicated Fight Pad module caters to competitive fighting game players. A Track Pad module expands the controller’s usefulness for FPS titles or mouse-style navigation, further reinforcing the “one controller, endless possibilities” philosophy.
Under the hood, the X5 Alteron is built for performance as much as flexibility. Capacitive thumbsticks with adjustable heights are designed to eliminate stick drift entirely, while mouse-click style Hall Effect analog triggers promise fast, consistent input. The controller also includes rumble motors, programmable back buttons, hot-swappable ABXY buttons, and a mix of tactile and membrane buttons to fine-tune feel and responsiveness. Bluetooth 5.2 and USB-C charging round out a feature set that feels firmly modern, despite the controller’s nostalgic visual cues
