Here is the introduction video for XTAR BC4. It has five main features: 1. Independent four-slot, charging 1.5V lithium and 1.2V Ni-MH/Ni-CD AA and AAA batteries. 2. Tiny size, one-hand operation. 3. Type-C Input, USB Output 4. LED Light for Emergency Use 5. Wide applications, such as electric toys, remote controls, and electric razors, etc.