Question 1

How far does the green laser pointer reach in a room with a lot of wireless signals??

Accepted Answer

Dear, With top-grade microchip, the laser light is up to 200m(330ft), the control range is up to 100m without wireless signal. 
Its control distance will be affected if there are many signals, but it will not affect too much.

Question 2

How long can you present on a single charge?

Accepted Answer

Dear Buyer:
Built-in 360mAh rechargeable battery provides weeks of use on only a 2-hour charge.
You can use it for 2 weeks at least, depends on different user, some users can use it after half a year. 
The standby mode is 180 days
KNORVAY

Question 3

How do I connect this to my laptop? Nothing happens when I plug the USB in.

Accepted Answer

When you plug it in with the usb lead provided, a red light should come on on the front end on the flat top of the device.  My own laptop only provides a charge when it's switched on, I think.  It should take quite some time to input the initial charge.

Question 4

do i have to use a computer? Can i just plug the usb into the TV use the laser pointer to point at the screen? I don't need the other slide functions.

Accepted Answer

Good Evening,
I see 2 questions here and I'll try to answer each one separately:-
1) You don't need to plug the pointer into anything.  As long as the batteries have been charged (using the USB charger cable) you disconnect this cable and just point at whatever you want and press the button on the pointer to get the green laser-spot. 
2) You seem to want to point at a TV screen.  Unfortunately, laser pointers (either green or red spots) don't show up very well on TV screens.  The spots ARE visible but nowhere near as intense as when you point at a projection screen, or another solid surface.  I think it's 
because a modern TV screen doesn't reflect the coloured spot very well.
Laser pointers are really designed to highlight parts of a picture or text that you're displaying when giving a talk using Powerpoint (for example).
I hope these answers help.
Good luck!

ASIN	B07S1R271V
Battery Types	Lithium-Ion
Best Sellers Rank	1,235 in Stationery & Office Supplies ( See Top 100 in Stationery & Office Supplies ) 6 in Presentation Remotes
Brand Name	Norwii
Colour	Green - Rechg. - USB-A
Compatible Devices	Laptop, Computer, Projector, Smart Board with Windows, macOS, Android, Linux and ChromeOS
Controller Type	Wireless
Country of Origin	China
Customer Reviews	4.3 4.3 out of 5 stars (509)
Item Dimensions L x W x H	20L x 18W x 139H millimetres
Item Highlight	Slide Advancer with Green Laser Pointer, 100m Long Range Control, Customizable Button Page Turner, Hyperlink & Volume Control
Item Weight	32.1 Grams
Manufacturer	Shanghai Norwii Technology Co., LTd.
Manufacturer Part Number	N76 GBK
Maximum Number of Supported Devices	1
Maximum Range	328 Feet
Model Name	N76
Model Number	N27
Network Connectivity Technology	Radio Frequency
Number of Batteries	1 AAA batteries required. (included)
Number of Items	1
Number of Packs	1
Product Features	Green Laser Pointer, Hyperlink & Volume Control, Long Operation Range (100m), Rechargeable, Suitable for teachers classroom meeting lecture board
Product Warranty	1 Year Limited Hardware Warranty

N76 Wireless Presentation Clicker for Powerpoint, Presenter Remote Control

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