For Use With: PocketJet 3 Plus, PocketJet 6 Print Engine, PocketJet 6 Plus Print Engine, PocketJet 6 Print Engine with Bluetooth, PocketJet 6 Plus Print Engine with Bluetooth, PJ663-K, RJ4030 RuggedJet w/Bluetooth, RJ4030-K RuggedJet w/Bluetooth + Battery, RJ4040 RuggedJet w/WiFi, RJ4040-K RuggedJet w/WiFi + Battery