We are committed to providing safe and reliable power products that can be used to charge drone battery, whenever you need it. Our advantages of Drone Battery Charger: Energen drone battery chargers are intelligently designed to charge up to 4 batteries simultaneously with built-in overcharge protection and automated cooling control system. The upgraded Energen multiple drone battery charger only needs to purchase another battery charging cable to compatible with DJI Phantom 4 / Mavic Pro / Mavic 2 Pro / Mavic Air / Mavic Air 2 drone batteries (*Mavic Pro charging cable included)Energen Drone battery chargers also come equipped with 2 USB charging ports charging your smartphones, tablets and other USB devices. Aluminum enclosure provides excellent heat dissipation. It protects the internal circuitry from outside elements. It is fire resistant, non-conductive (anodization is non-conductive). Easy to use, spend 2 minutes to read our user manual to master the method of use.