Compatible with Pi 3 and Pi Zero family of boards. Not compatible with the Pi 4.The CanaKit MicroUSB PiSwitch provides a premium quality and reliable power switch to the Raspberry Pi 3 and Pi Zero family of boards. It is made of high quality materials to minimize electrical resistance. A low quality in-line switch can create high electrical resistance and reduced voltage, and so the switch conductivity and material is essential when used with the Raspberry Pi 3 and Pi Zero