Pairing HiPen H3

How do I make my HiPen H3 Bluetooth discoverable so Windows 10 Bluetooth can find it? I have tried holding the buttons for up several seconds, but nothing works.

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No Bluetooth connection required.
If you put AAAA battery in the pen, you can use it right away.

My HiPen H3 was paired via Bluetooth and showed up in the list of Bluetooth paired devices, which also showed the battery level of the pen. I accidentally deleted it and now I cannot figure out how to put it into Bluetooth pairing mode. It’s true that you can use it without pairing it via Bluetooth, but it doesn’t show up in the Bluetooth devices list so you can check the battery level.