-The Penfill cartridges are quick and simple to change.
- End-of-dose click.
- Comes in two colors and a choice of fun skins.
- Easy to set and easy to read dose-display
- Easy-to-use dial
- Easily correct a dose by simply turning the dial the other way
- Clicks when dialing up and down
- Dial will not select more units than what is left in the cartridge
- Robust design that is built to last up to 5 years
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