They're built to military standards for thermal, shock and water performance (MIL-STD-810G). They also include tactical features such as compatibility with night vision goggles and Jumpmaster mode. Durable, constructed to military standards (MIL STD 810G); night vision goggle compatible.Works with GPS, GLONASS and galileo satellite systems to provide accurate positioning. Know where you are with navigation sensors, including 3 axis Accelerometer, 3 axis compass and a Barometric altimeter; smart notifications¹ allow your Device to receive emails, texts and alerts. This item is in the category "Consumer Electronics\Vehicle Electronics & GPS\GPS Units". The seller is "mvpextreme" and is located in this country: US. This item can be shipped worldwide.