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That means the value of a single vote at 100% vote power by that particular bot.
For example my value of vote at 100% is 0.001, so if I upvote some one he will get 0.001.
The voting power of 100% goes down as i keep voting more and more people and so does my vote value at rate of 2% and it replenish automatically at 2% every 2.4 hrs, that how steemit works. If you noticed every bot cycles their round every 2.4 hrs.

let me know if you need more clarification, I understand these things are difficult to understand at first.