They are added during 活动 and can only be obtained during a limited amount of time. They can be used to blind, deafen and stun a Killer, if they explodes near enough to them. They are single-use only.
This Firecracker was added with Patch 1.4.0 in early 2017 for the Chinese New Year Event.
This winter-themed Firecracker was added with Patch 1.8.3 in late 2017 for the Winter Solstice Event.
There are currently no 附加品 available for the Firecrackers.