The Nitecore UNK2 battery charger is compatible with the Nikon EN-EL15, EN-EL15a, EN-EL15b and EN-EL15c camera batteries, which are used in a range of Nikon cameras, including the D500, D7500 and Nikon 1V1. The charger is compatible with various power sources, including solar panels, power banks and USB adapters.Nitecore have carefully considered the requirements of a photographer and created a charger that can charge two of the Nikon batteries simultaneously, to ensure no moment is missed due to power inadequacy. The slots have a maximum output of 1000mA, providing fast and efficient charging. The UNK2 features a high definition LCD display which provides real time information, including the battery health, temperature, level and voltage, plus charging current and charged volume. The charger has an innovative battery health detection which runs automatically when the battery is inserted, displaying either good, normal or poor. In addition, the charger has built-in reverse polarity and anti-short circuit protection and will show an error message on the screen if it detects a defective battery.Compact and lightweight, the UNK2 is ideal for photography when you are on the go. The USB cable is stored neatly in the side of the charger for maximum space utilisation and protecting the cable from potential damage.