#optical blue switch

Punkston TH61 60 Mechanical Gaming Keyboard, RGB Backlit Wired Ultra-Compact Mini Mechanical Keyboard Full Keys Programmable Black

Keychron K6 68-Key Bluetooth Wireless/USB Wired Gaming Mechanical Keyboard, RGB Backlight/Optical Blue Switch/N-Key Rollover, Compact 65 Layout Keyboard for Mac Windows

Keychron K6 Wireless Bluetooth/USB Wired Gaming Mechanical Keyboard, Compact 68-Key 65 Layout RGB LED Backlit N-Key Rollover Aluminum Frame for Mac Windows, Optical Blue Switch