Take note if you are a using a Logitech Unifying USB dongle, they are wildly insecure - HardwareZone.com.sg
Original Logitech USB Unifying Receiver, 2.4 GHz, compatible logitech Unifying Devices for PC / Mac / Laptop | Lazada Singapore
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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