Will it work with the ct midi

No, it's not compatible with the CT MINI, CT MIDI or CT SYS. However, the new CT MINI and MIDI for being released on August 1st 2019 will include built-in Bluetooth capability, link below to those models.https://www.festoolproducts.com/catalogsearch/result/index/?q=bluetooth&tn_product_type=Vacuum