The last three binoculars on the left are "for military use only," but if you're lucky and come on a slow day the soldiers will be lax about it and let you use it for free!
If it's a clear day you can have a nice view of North Korean post right after border, Kaesong industrial complex and glimpse of largest city in the area.
Gaze into North Korea and perhaps ever hear their propaganda suggesting you pay them a visit. Binoculars cost a small donation. Note the lack of trees across the border. ;)