This is a set of KEYENCE's compact PLC and I/O units. Model ①: KV-10AR Model ②: KV-24AR Model ③: KV-E8T Output Unit Model ④: KV-E4X Input Unit Thank you for viewing. I have confirmed that the PLC unit powers on and can be monitored with KV-STUDIO. Please note that some terminal block covers and communication port covers are missing, and there are scratches and dirt. Please check the images and only purchase if you agree. Feel free to comment or request a price reduction. If you wish to purchase individual items, please comment.