Equip only to a Thunder-Type monster. It gains 100 ATK for each Thunder-Type monster in your Graveyard. You can send this face-up card you control to the Graveyard to have 1 face-up Thunder-Type monster you control gain 1000 ATK.
After you have sent Wattcube to the Graveyard to make your Thunder-type monster gain 1000 ATK, you can use Swords at Dawn to re-equip Wattcube from the Graveyard to that monster, and sent it to the Graveyard again to gain another 1000 ATK.
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