For DJI Air 3S / 3 Two-way Charging Butler Battery Charger (Grey)1. Exclusive design: A two way charging butler designed for DJI Air3 original batteries, designed to fit the size of Air3 batteries, with two battery slots, which can charge two batteries at a time; 2. High quality materials: Made of ABS+PC materials, the surface is smooth and burr free, sturdy and durable; it can be charged in the upright position, controlled by an intelligent chip, and has stable input and output without damaging the battery; 3.