Ergonomic Vertical Mouse Wireless 1600 DPI USB Optical Computer Mouse 5D Gaming Laptop Mice For PC Notebook Q&A: 2. I don't receive the usb receiver? The USB receiver is at the bottom of the mouse, please check it first. If you still can not find it, contact us for help. 3. If the mouse can be worked on Macbook or Apple Computer? Yes, the mouse can be worked for Macbook and Apple Computer.But the backward button and forward button cannot be used. 5. Why does the mouse need add a mouse pad to use better? Because it is an opto-electronic mouse, if it add mouse pad , it will work better! Specification: Item: Vertical Mouse with mouse pad Type : Wireless Mouse Design:Ergonomic Mouse Colour Of Mouse: Black,White Power Supply : 2 x AAA Battery (Not Including ) Mouse Demension: 125*65*82mm Mouse Net Weight : 109g Adjustable DPI : 800-1200-1600 Button : 5 Buttons (Not Including Scoller ) Package Included: 1 x Wireless mouse 1 x USB Receiver