DT-NH821D is a high-performance night vision device built by Detyl.This product is connected to a dual bridge and can also split into two monoculars for use. The maginification of this product can be changed by replacing the objective lens or connecting a-focal lens. Due to the use of a unique high-performance optical system and image intensifier tube, it has the characteristics of clear imaging without distortion. It is a cost-effective night vision device,which is suitable for both millitary and civilian.