Assertion: pen's button | /r/CapableOf | hold to inject the dose
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text: Injector pens remove some of the complications of syringes by allowing the pen to be "pushed" against the skin at a 90 degree angle (removing the need to inject at a proper angle as is the case with syringes), as well as by replacing a long, thin plunger of a syringe with a simple button which is depressed and held to inject the dose.