The kick stage rocket produces 120 newtons (27 lbf) of thrust, and has a specific impulse of approximately 320 seconds.
[4] During the first flight in January 2018 where Curie was tested, the Electron third stage—also referred to as the "kick stage"—coasted for roughly 40 minutes after successfully deploying an Earth-imaging Dove satellite built by the company Planet Labs, then ignited the Curie engine on its first in-space test.
However, Rocket Lab stated that future launches would have the stage deorbited after releasing their payloads to prevent addition to space debris.
[6] In August 2020 Rocket Lab indicated that the kick stage uses an unspecified liquid bi-propellant fuel for the Curie engine.
[1] Rocket Lab has also developed a version of the Curie engine with more thrust called HyperCurie.