Transaction type: importance. What is it?

Please, help! I installed a Nano wallet a few days ago and connected an Android app to it.The transaction history does not indicate anything, but explorer says that a transaction has been made with a zero balance and a commission of 0.15 XEM.
Type: importance.
Should I worry or is this an XEM activation?

Hello,

This is transaction to enable remote harvesting. It wasn’t done by you? It’s IMO possible to done it only from nanowallet.