The ND-NV31 is compact in size and lightweight, making it highly portable. It has a long battery life of up to 20 hours, effectively avoiding the trouble of frequent charging. The ND-NV31 is also equipped with an intelligent sensing function. When the device is flipped upwards or sideways, the screen will automatically turn off. The ND-NV31 is equipped with an 850nm infrared fill light, which can provide clear and bright images even in dimly lit environments, meeting the usage requirements in various low-light scenarios. The ND-NV31 has excellent protective performance, reaching the IP67 protection level. It can effectively prevent dust and water, and can operate stably even under harsh environmental conditions.