101Leafy researched the game with the Hilltop Works fan translation patch, English translation by Cargodin
EMF Key電磁キー
EMF Key is item 22 of the game's item table, in the Items group. The script never names it.
Opens the gate to Bailey Street
庇利路の入口を開くことができる。
It never shows up on its own in a talk with a picture, so it has none here.
Item table: Clock Wire EMF Key Lubricant
English translations by Cargodin for Hilltop Works Fan Translation Patch: https://www.patreon.com/hilltopworks/posts/kowloons-gate-160555525?collection=18503