The Nissan physical insert-to-start car key shell is a traditional Nissan vehicles that still rely on a mechanical ignition cylinder
Head: Solid black plastic housing with a slightly rounded rectangular shape. It usually features a pattern of small raised dots or a textured surface for grip, and a keyring hole at the bottom.
This is usually sold as an empty shell (or shell + uncut blank blade).
You transfer the original transponder chip (or have a new one programmed) and have the blade cut to match your existing key.
No remote buttons are present — lock/unlock functions (if equipped) are handled separately or not at all on pure mechanical versions.
In short: it is the classic black plastic + metal blade key that you physically insert and turn to start the Nissan, with a built-in immobilizer chip in the head.