USB receiver for Logitech mk270/mk260/mk220/mk345/mk240/MK235 Keyboard mouse
Logitech M185 Compact Wireless Mouse - Designed for Laptops
Amazon.com: Logitech Unifying Receiver, 2.4 GHz Wireless Technology, USB Plug Compatible with all Logitech Unifying Devices like Wireless Mouse and Keyboard, PC / Mac / Laptop - Black : Electronics