The main difference is the connection. The C1 USB-C Wired Mouse plugs into a USB-C port with a cable, while the M1 Mouse is a fully wireless Bluetooth mouse with no wired option.

• C1 USB-C Wired Mouse: wired USB-C connection, 4 DPI levels (800, 1200, 2400, and 3200)
• M1 Mouse: wireless Bluetooth connection only