Input Sensitve, how to pick?

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on my Edifier speaker R1280DB, there's this option of input, appearently have different sensitive, the figure are all different.

Can some one help me understand these figure better? And tell me which one is better? Many thanks.

Input sensitivity:

  1. LINE IN1: R/L:450±50mV
  2. LINE IN2: R/L:550±50mV
  3. OPT/COA: R/L:500±50mFFS
  4. Bluetooth: R/L:700±50mFFS
 
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