Keychron K5 Mechanical Keyboard

The Keychron K5 UltraSlim US is a full-size mechanical keyboard designed for users who want a slim profile with versatile connectivity and switch options. It suits office workers and casual gamers who prefer a low-profile typing experience with the ability to switch between multiple devices. Its hot-swappable optical switches allow customization without soldering, making it a good choice for hobbyists who want to experiment with switch types.

Key Features

• Ultra-slim design at 18mm thick reduces finger fatigue and supports ergonomic typing with a slight base incline.
• Hot-swappable low-profile optical switches enable quick switch changes without tools, allowing easy customization of typing feel.
• Supports connection to up to three devices via Bluetooth 5.1, with seamless switching between them, plus wired USB-C connection for stable use.
• Full 104-key layout includes a number pad and dedicated keys for macOS and Windows, such as Screenshot and Siri/Cortana keys.
• Adjustable 4-level RGB backlighting provides visual customization and visibility in various lighting conditions.

Build Quality

The keyboard has an aircraft-grade aluminum body that balances durability with a lightweight feel at about 650g. The ABS keycaps are standard but include both Windows and Mac legends for cross-platform use. The low-profile mechanical and optical switches offer a slim and modern aesthetic.

Typing Experience

Users can choose between Gateron low-profile mechanical switches or Keychron optical switches, each with different tactile and sound profiles. Mechanical switches provide tactile feedback with a 50 million keystroke lifespan, while optical switches offer faster response and a longer lifespan of 70 million keystrokes. The low-profile design reduces key travel distance, which may improve typing speed and reduce fatigue but might feel less substantial to those used to traditional mechanical keyboards.

Connectivity

The K5 supports Bluetooth 5.1 for wireless use with up to three devices, allowing quick switching via a side button. Wired connection via USB-C is also available for lower latency or charging. Battery life varies by backlight usage, with longer times when backlighting is off or minimal.

Compatibility

The keyboard is compatible with Windows, macOS, Android, and iOS. It includes keycaps and layouts optimized for both Windows and Mac users, which is helpful for those who switch between operating systems. Firmware and key remapping options are unknown.

Trade-offs

• The hot-swap feature is limited to the optical switch version only, so mechanical switch users cannot easily change switches.
• Low-profile switches may not satisfy users who prefer the deeper travel and stronger tactile feedback of standard mechanical switches.
• Num Lock functionality is only supported on Windows, which may limit number pad use on macOS.
• The ABS keycaps may wear faster than higher-quality materials like PBT.