At first glance, Pineapple looks like a grenade, but it’s a decent keyboard. It is modeled after the Mark II grenade used by the US military during World War II, and is nicknamed “Pineapple” because of its shape.
The pineapple keyboard works just fine. 4 keys in 6 rows are attached, and the 25th key is hidden. It is the shape that comes out when you pull out the pin. The border of the pineapple is made with a 3D printer, and the function code in the middle is downloadable because it is connected to GitHub. Related information can be found here.