1.Does it make big sound or annoying click noise when you click the buttons?
This version mouses we are providing are all silent. If you dont like that click noise sound or dont want to bother others when you play game or doing work, this mouse will be the best choice for you.
2.Is it programmable? Do I need to download software to use it?
It is not programmable. And this is 2.4G wireless mouse with USB receiver. Just plug and play. Do not need to download any driver or software.
3.How do I adjust the DPI levels?
Users can adjust the DPI by clicking the middle button of the mouse. 3 DPI levels (800-1200-1600)for work, casual games, painting, etc.
4.What is included in the package?
1 x Silent wireless mouse; 1 x Charging cable; 1 x USB receiver (in the bottom of the mouse); 1 x User manual.
5.What is the charging time and using time of the mouse?
About 80 minutes for fully charge. The using time can up to 70 hours.