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Interface: 2.4GHz Wireless. Wireless Receiver: Nano USB receiver. Cursor Tracking Speed (dpi): 1000 dpi (Dots Per Inch). Movement Detection Technology: Optical. Buttons and Function: 3 buttons: Left, Right, Wheel with scroll and click. Dimension (H x L x W): 31.4 x 101 x 62.3 mm. Weight: 75g ± 3g (incl. batteries /excl. dongle). Battery Type: 2 AAA batteries.