UPDATE 16/06/2021:After lots of testing and iterating, we are happy to announce the BT60 is now in production! There are a total of 480 PCBs in the first batch, half are hotswap and half soldered. They will be heading out to retailers in the next month. Here's the vendor list and prices:
Upgrade Keyboards (USA) - $55-65
https://www.upgradekeyboards.com/product/bt60-60-hotswap-or-soldered-tray-mount-wired-or-wireless-pcb/Keygem (EU) - €55-60
https://keygem.store/products/bt60-60-bluetooth-pcb?variant=40309989572774Mechboards (UK) - £60-65 (LIVE)
https://mechboards.co.uk/shop/parts/bt60-pcb/Hotswap Features:
- Bluetooth connectivity (Works in metal cases!)
- Connect to up to 5 devices
- Weeks of battery life (1200mAh battery included 4x30x80mm)
- Fits into most 60% cases
- Standard ANSI layout
- Solder pads for optional split back space
- USB pins broken out
- ESD Protection
Soldered Extra Features:
- Encoder support
- Lots of layouts (no room for a split space)
We tested the range in a TFV2 with a brass plate and found it to be about 30m in open air.
UPDATE 04/03/2021:After the initial post, a lot of comments were asking for a soldered version with support for multiple layouts. So we decided to go ahead and design just that, it will be sold alongside the hotswap version of the board and has support for the following layouts:
It also has support for a rotary encoder, either in the top right or to the right of a 1.75u right shift. We also tried to fit on a split spacebar but that wouldn't have left space for the module, which lives under the spacebar area. Currently, we are working on testing the new PCB. We are happy with it so far and we will be sending units to beta testers shortly.
BT60 - Wireless 60% PCB with standard footprint
The Polarity Works BT60, a simple, functional, hotswap wireless 60% that drops into most cases. The BT60 focuses on a polished experience rather than every bell and whistle. The Nordic Semiconductor BLE module delivers high performance and excellent range even in metal cases, and in conjunction with ZMK, it delivers the functionality to match. Zephyr's energy optimisation delivers fantastic battery life and with an easy-to-use UF2 bootloader making changes is as simple as drag and drop, no DFU drivers, no programming software, just double-tap reset or use the bootloader keycode and it pops up as a thumb drive. If you wish to make customisations ZMK's module-centric design lets you make changes without installing build environments or screwing around with path variables, just set up a ZMK-config GitHub repository, then build it in the cloud with GitHub actions and download the UF2 directly to your keyboard!
As a drop-in replacement for any DZ60 footprint PCB, it's an easy and inexpensive upgrade to free yourself from wires for weeks at a time.
Quick Demo -
https://youtu.be/OJloE9lCjD8Features:- Bluetooth connectivity
- Weeks of battery life (battery included)
- Fits into most 60% cases
- Hotswap sockets
- Standard ANSI layout
Price:£50-60We are still gauging interest and confirming with manufacturers so this is just an estimate. We don't expect this to be higher, though it could drop if there is enough interest.
Feedback:Let us know what you think of the BT60 here:
https://forms.gle/bT5okqymYH3DGySY9If you'd like to receive regular updates on the project, head over to our Discord here:
https://discord.gg/X7snWCTAvz 
