I was an early backer and I don't remember selecting the femto upgrade but it says it's the Pulse fi so I thought it was a perk for meeting a goal. It's been so long since the start of the campaign I don't remember most of it.
It's possible someone in the warehouse made a mistake when shipping. Or maybe you backed the upgrade and forgot. But the key thing is that the Pulse fi isn't the vanilla Pulse as it has 2 upgrades applied.