Holosun DRS NV Digital Rifle Sight Night Vision 101115 strobe mode and the latest strobe mode and the latest in power LED technology Chest pockets with dual access utility compartments with hook and loop closure for easy access and storage High impact melamine buttons Dual communication wire access openings in side seams keep wires obscure Flex underarm mesh vents provides body heat ventilation and increased range of motion The newly enhanced Dutymaxx shirt now offers technology such as Nano Fluid Repellency that keeps wearer dry and comfortable Country of origin: CN DRS NV also features an Observation (OBS) mode which increases battery life by 20% by disabling image and recording functions