YUNZII B75 PRO Mechanical Keyboard

Product Information

• Model: B75 PRO
• Battery: 4000mAh
• Layout: 82-Key, 75% Layout
• Structure: Gasket
• RGB: South Facing RGB
• Size: 334.4*143.6*42.15mm / 13.17*5.65*1.66inch
• Weight: 970.5g / 2.14lb
• Software: Windows
• Frame Material: ABS
• Keycap: Double-Shot Cherry Profile PBT Keycaps
• Connection: Bluetooth 5.0, 2.4G Wireless, Type-C Wired
• System Compatibility: Windows/Mac/Linux/Android/iOS
• Hot Swappable: Full-Key Hot Swappable, Supports 3/5 Pins Hot Swappable Switches

Keyboard ON/OFF Manual

Switch and Indicator:

• Type-C Port
• Tri-Mode Switch (Bluetooth, Wired, 2.4G Wireless)
• 2.4G Slot
• CAPS LOCK Indicator
• WIN LOCK Indicator
• 2.4G Indicator
• BLUETOOTH Indicator

Multi-Function Knob (Default Multimedia Mode)

Multimedia Mode:

• Press to mute/unmute.
• Rotate clockwise to increase volume.
• Rotate counter-clockwise to decrease volume.

RGB Mode:

• Press to change backlight effect.
• Rotate left/right to adjust backlight brightness.

Switching Mode:

• Long press to switch between RGB/Multimedia knob control modes.

Connectivity

Bluetooth Connection: FN+1/2/3

1. Switch the mode button to Bluetooth Mode.
2. Short press FN+1/2/3 to select a Bluetooth channel; the Bluetooth indicator will flash slowly.
3. Long press FN+1/2/3 for 5 seconds to enter Bluetooth pairing mode; the Bluetooth indicator will flash quickly.
4. Select YUNZII B75 PRO BT1/BT2/BT3 to connect. The RGB will stay on when paired successfully.
5. Note: If pairing fails, the keyboard indicator will turn off and go to sleep. Please reconnect.

2.4G Wireless Connection: FN+4

1. Switch the mode button to 2.4G Wireless Mode.
2. Short press FN+4 to select the 2.4G channel; the 2.4G indicator will flash slowly.
3. Long press FN+4 for 5 seconds to enter 2.4G pairing mode; the 2.4G indicator will flash quickly.
4. Plug the 2.4G dongle into your device. The device will automatically recognize your keyboard, and the RGB will stay on when paired successfully.
5. Note: If pairing fails, the keyboard indicator will turn off and go to sleep. Please reconnect.

Wired TYPE-C Connection:

Switch the mode button to USB Wired Mode and connect the keyboard to your device using the included Type-C cable. The connection is successful after the keyboard is automatically recognized.

Backlights

• FN+Backspace: Backlight Effect ON/OFF
• FN+INSERT: Change Backlight Effect
• FN+END: Change Backlight Color
• FN+PGUP: Lighting Effect Direction
• FN+ ↑: Brightness Up
• FN+↓: Brightness Down
• FN+→: Blinking Speed ↑
• FN+←: Blinking Speed↓
• FN+Space: Custom Backlight Color

FN Shortcuts

Windows

MacOS

Win&Mac

Battery Information

Low Power Mode & Charging:

• When battery is below 15%, the Spacebar will flash red slowly.
• During charging, the Spacebar will stay solid green.
• After charging is complete, the Spacebar returns to the normal RGB mode.

Battery Query:

• In wireless mode (Bluetooth/2.4G), press and hold FN+Right Ctrl to check battery power. The number keys 1-0 will light up to display the power percentage (e.g., 1-5 lights up means 50% power left). The backlights will turn off. Releasing the keys returns the keyboard to its previous lighting mode.

Power Saving Mode:

• When connected wirelessly (Bluetooth/2.4G), if there is no operation within 3 minutes, the keyboard enters sleep mode. The lights will turn off, but the keyboard remains connected. Pressing a key will wake the keyboard and output characters simultaneously. After 10 minutes of inactivity, the keyboard enters deep sleep mode, disconnecting. Pressing a key will wake the keyboard, and it will automatically reconnect. Character output will be normal after reconnection.

Custom Web Software

The B75 PRO keyboard features customization functions for both Windows and macOS. Users can follow the on-screen prompts to customize settings at https://app.qmk.top/, or download and install the B75 PRO software from the YUNZII official website.

Attention

1. If the 2.4G dongle is plugged in but the device cannot recognize or use it, it may be due to poor contact.
2. If the keyboard backlight dims or the product functions abnormally, it indicates insufficient battery power. Charge the keyboard promptly. Connect the keyboard to a PC using the included Type-C cable for charging. Charging time may vary slightly depending on the power source.
3. If the keyboard becomes unresponsive or malfunctions, besides low battery, it might be due to co-channel signal interference. In such cases, connect the device via Type-C cable in wired mode and then switch back to Bluetooth/2.4G channel.
4. YUNZII wireless products use built-in lithium batteries. The B75 PRO keyboard uses a 4000mAh lithium battery. For user safety, use the product indoors at room temperature only. Avoid high temperatures and proximity to fire sources.
5. Do not use plugs, power strips, or power banks to charge the product. Only connect the keyboard to a computer for charging.
6. If the product is damaged beyond repair, do not disassemble it or dispose of it in fire. Send it to a professional recycling station or designated recycling bin to avoid accidental risks.
7. For any product or usage questions, please contact the YUNZII after-sales support team.

Package Contents

• 1 x B75 PRO Keyboard
• 1 x Type-C USB Cable
• 1 x Switch and Keycap Puller
• 1 x Function Card & Manual
• 1 x 2.4G Dongle
• 1 x PET Dust Cover
• Extra Keycaps and Switches