Confirmed it is working. Got a Surface Pro 3 keyboard and plugged the adapter to it. The adapter turns itself on automatically, bravo!
Then on my PC > Change PC Settings > PC and devices > Bluetooth. It detected and paired with the adapter. My PC do not have Internet at the moment I pair the adapter, so I bet the driver comes with every Windows (8.1). No pairing key is needed.
However, the touchpad is not detected as a precision touchpad, and I bet it will never work that way. The adapter is a discontinued product and making it a "precision touchpad" will involve building a new Bluetooth profile + firmware upgrade. I guess the adapter simply turns the typing cover into a generic HID.
- No two-finger scrolling on the touchpad (it is not recognized as a "precision touchpad")
- No scroll on edge (like Synapse touchpad driver feature)
- Okay to double click-and-hold to mimic mouse dragging
- Both tap and click register as a mouse click (tap is always left mouse button, click depends on the position)
- No edge gesture to brings up charm bar
- All Fn keys works correctly, use Fn+Caps to toggle Fn always on/off
- Fn + up/down/left/right to PgUp/PgDown/Home/End
- Do not turn a laptop into a tablet mode (i.e. virtual keyboard will not comes up when focusing on textbox in Store Apps)
- Backlit of Surface Pro 3 keyboard works properly (dimmable by F1/F2)
- CapsLock key will lit up properly, including pressing CapsLock key on host keyboard
- Show up as a custom icon in Devices and Printers (a.k.a. Device Stage)
The wireless adapter expose the following device features in Bluetooth properties page:
- Bluetooth HID Device
- Device Identification Service
- HID-compliant consumer control device
- HID-compliant mouse
- HID-compliant vendor-defined device
- Service Discovery Service
- Surface Wireless Adapter (type is "Keyboards")
- Surface Wireless Adapter for Typing Covers
The notch on the typing cover matches the adapter perfectly.
Let me know if you have a specific question.
Update: I tested the Surface Pro 3 keyboard with the original Surface which runs Windows RT, with latest Windows Update as of now. The keyboard fit the notches and is usable. But unfortunately, it is not detected as a "precision touchpad" device. So it got the same experience as the wireless adapter, i.e. detected as standard HID-compliant keyboard/mouse.
p.s. if you have the adapter but not the keyboard, you cannot turn on the adapter and pair it to your PC. You must plug a keyboard cover to turn on the adapter
p.s.s. my testing PC is an Atom netbook about 5-8 years old, with built-in Bluetooth adapter