The Port Doubler turns the GPIO bar of the Raspberry (B+, 2B, 3B, 3B+, 4B) into 4 GPIO bars.
This gives you many more opportunities for your project.
Through its very compact design, hardly any additional space is required.
Provides 4 GPIO bars
Attaches directly to the existing GPIO bar of the Raspberry Pi
55 x 66 mm
Port-Doubler, Mounting material