What is the red mark on front of the mouse for?

That's where the antenna array for wireless operation is located. Please do not cover or paint over this marking so as to ensure optimal performance. 

That's where the antenna array for wireless operation is located. Please do not cover or paint over this marking so as to ensure optimal performance. 

Applicable Models

EC1-CW (L), EC2-CW (M), EC3-CW (S), U2 (M)

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