The interface expansion board specially designed for Raspberry Pi can extend five groups of 2x20 pin headers to your Raspberry Pi, so as to connect to multiple Raspberry Pi expansion boards for various experiments.Based on the Raspberry Pi interface design, it can be directly inserted or connected through a cable5 groups of 2x20 pin headers are extended outside to facilitate access to multiple Raspberry Pi expansion boardsOnboard USB external power supply interface, no longer worry about insufficient power for connecting multiple boardsThe front is marked with a clear pin function silk screen, which is convenient for wiring.The connection pads are reserved on the back, and the connection pins can be changed by soldering to avoid pin conflictsNote: Before connecting different expansion boards, it is necessary to check whether the pins of the expansion board conflict with each othercolor:BlueMaterial:PCBsize:183 x 65mmPackage Contents:1 x Stack HAT1 x Flat wire 40PIN1 x 2x20PIN long pin header1 x RPi copper pillar package (4PCS set)Only the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.