Hello, and congratulations on your new UHK! Thanks so much for your support!
Let's unbox your UHK and split the halves by pulling them apart in opposite directions:
It's up to you how much space you leave between the halves, but your wrists should be aligned straight-on with each half:

Good posture

Bad posture
Connectivity
USB: Connect the right half via USB and connect the halves via the spiral cable. If your UHK has batteries, the spiral cable is unnecessary as the halves will communicate wirelessly, but it's convenient to avoid regular charging.
BLE: Select "UHK 80" on the host device and enter the pairing code on your UHK. If "UHK 80" doesn't appear in the Bluetooth devices list, you may have an older host that only supports the older Bluetooth Classic standard instead of the newer BLE (Bluetooth Low Energy) standard. Only BLE is supported by the UHK 80.
Dongle: Pair the dongle with your UHK.
Switching between connections
Use the following default mappings of the Fn2 layer for connection switching. The top row mappings enable absolute connection switching, while the bottom row allows for relative connection switching.

Putting the UHK to sleep
The UHK 80 doesn't have dedicated power switches by design, but it does have a sleep mode that disables the keys, backlight, and wireless features to preserve battery, which is useful for transportation or storage. You can enter sleep mode with Fn2+Pause and wake up the left half with S+F and the right half with J+L.OLED display content
- The top left icon shows whether the halves are connected, and if so, wirelessly or via the bridge cable.
- The top center icons indicate the status of Caps Lock and Num Lock.
- If your UHK 80 contains batteries, the top right percentages indicate their charge levels.
- The middle row shows the name of the current keymap
- The bottom row shows the current connection.