the A3 v-1 had 4 modes to choose from, regular stabilization, auto balance, auto hover and off. It also have 3 pots on the front. The a3-l v2, has 3 modes: regular stabilization, avcs (3d mode) (heading hold), and off and only 2 pots on the front. Then they made the a3 Pro which has 6 modes to choose from and 3 pots on the front.
They basically made the low end A3 a bit easier and left the more advanced setup to a new one.
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