Dial-A-Dose Insulin Delivery Device (Pen-Injector) cartridge holders || Product Usage: || The NovoPen Echo¿ is a re-usable pen injector for single patient use by diabetics for the self injection of a desired dose of insulin. The pen injector uses Penfill 3 mL cartridge of NovoLog¿, 100 units/mL (Ux100) [insulin aspart (rDNA origin) injection] and a single use detachable and disposable pen needle (supplied separately). The pen injector allows the user to dial the desired dose from 0.5 to 30 units in 0.5 increments.