Transmission Gear is a Normal Trap Card.
Trap Cards are normally Set first and can be activated on a later turn, often in response to an action.
On the current TCG and OCG Forbidden & Limited lists tracked here, Transmission Gear is Unlimited.
YGOPRODeck lists Transmission Gear for these formats: TCG, OCG, Master Duel.
A listed print of Transmission Gear appears in Code of the Duelist (COTD-EN080) at Short Print rarity.
Among markets shown on this page, the lowest listed snapshot for Transmission Gear is about $0.18 on TCGPlayer (prices change frequently).
