It's already been armed.

I picked it up in Cuba. Because you're already dead, get it? Thank you. Stanley, Stanley, Stanley. Sunnydale Memorial, do you copy? Kate, please let me out here. We have a Caucasian female, twenty one. Yeah, a little home improvement. It's called an echo. I gotta go. I will stay close to you, Kai. You been working? Why did you help me that night in the te… You must teach me this if you live long… There's no return address.