Cloaking remote
From The Stargate Omnipedia
Long, thin device of Ancient design, allowing a user to cloak or de-cloak a Puddle Jumper without standing at the console inside the ship.
KEY EPISODE
Moebius, Part 1 - After SG-1 lands their Puddle Jumper in Egypt of the past General O'Neill activates the ship's cloak using the remote device.