Will the Key Blades from my current Slide V.01, 2.0, and 3.0 work in the 4.0?

Keyport Key Blades: Yes, all Blades are compatible
Pen Insert: Yes
USB Flash Drive Insert: Yes
Barcode Insert w/o Transponder Chip: Yes
Barcode Insert w/Transponder Chip: Your barcodes will still Slide out and work but the chip signal is blocked by the steel frame in the 4.0. You will need to transfer your chip to a Chip Module
Bottle Opener Insert: No, but the new MOCA II Module has a bottle opener.
Mini-Light Insert: No, but the Pocket Flare is a new and improved modular flashlight option.