The GPNVG18 is just a DUMMY model, no function You can see through the NVG model， But not clearly.Turn the horizontal axis to adjust the distance between the lenses. The GPNVG18 suitable for night vision base such as Wilcox G19/G24/G30/G34/G69/G70 Turn the knob, the user according to the actual situation to fine tune, adjust the hole distance.Comes with battery box model (non-functional) and power cord.The L4G24 mount can one handed operation； Low Profile shape on the helmet； Available in a Flat matte black finish optimized for nighttime covert operations. When Open and fold the L4g24 helmet mount，be sure to press the next button, otherwise the bracket will be damaged.（Be sure to press the next button, otherwise the bracket will be damaged. （If you accidentally damage the bracket, please send me a message and do not directly issue a return request） Pacakge list：1 * GPNVG18 model L4g24 mount