Definition: ARM handbook The Consumer Handbook to Adjustable-Rate Mortgages ("CHARM" booklet) must be presented to the consumer within three days of applying for an ARM loan (in addition to the ARM disclosure referenced above). More Questions on Mintrates: What is Rate Lock? What is Rate lock period? What is Real Estate Agent? What is Real Estate Agent®? What is Real estate broker? What is Real Estate Settlement Procedures Act (RESPA)?