Equip only to an "Ancient Gear" monster. The equipped monster gains 600 ATK. When this card is destroyed and sent to the Graveyard, inflict 600 damage to your opponent.
After activation, Special Summon this card in Defense Position: it is treated as an Effect Monster Card (Machine-Type/EARTH/Level 4/ATK 0/DEF 2000). (This card is still treated as a Trap Card.) While "Green Gadget", "Red Gadget", and "Yellow Gadget" are all face-up on your side of the field, the ATK of this card becomes 3000.