But both models say they have Bluetooth, wired, and 2.4Ghz connectivity. They both include a USB-C 2.4Ghz dongle, and both explicitly call out Bluetooth as a way to connect to certain devices, so must both have transmitters for that, too. The “Wireless” version calls its wireless protocol “8Speed” and lists its low latency as a feature, but the “Bluetooth” product page doesn’t say anything that would imply its non-bluetooth wireless is different. It merely doesn’t discuss it.

The only real hardware differences I’ve been able to discern so far are that:

• the “Ultimate 2 Wireless” version shows colored labels on the ABXY buttons, while on the “Ultimate 2 Bluetooth” version the labels appear to be white.
• the “Ultimate 2 Wireless” comes in black, white, and purple while the “Bluetooth” version only comes in black and white.
• the “Ultimate 2C Wireless” comes in mint, peach, green, and purple while the “2C Wireless” version comes in blue, pink, and dark blue.