HGLRC Zeus35 AIO is a control unit with ESC in one. It is especially suitable for copters, where it is necessary to save space or weight. The board has a pitch of mounting holes 20x20mm, but its size is larger than other mini stacks, so you need to be more careful when choosing a frame. The board supports 3-6-cell batteries, has memory for black box, current sensor and OSD. Suitable especially for 3", 4" and ultralight 5"(1106-1508 engines).