Your product’s model number (which typically looks like M-RBU126, V-UMB46, Y-UV90, R-IG7, etc. ) can usually be found:
M/N: V-U0032, V-U0034, V-U0033, R-R0007
If you already have a Unifying receiver and want to connect additional compatible mice or keyboards, you can get the Logitech Unifying software here.
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