nRF52840 USB Key with TinyUF2 Bootloader - Bluetooth Low Energy [MDBT50Q-RX] : ID 5199 : $15.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Leetro Green Usb Dongle Usb Key Laser Cut 5.3 Dongle For Co2 Laser Engraving Control System Leetro Controller Mpc6515 Mpc6525 - Cnc Controller - AliExpress