Thank you for viewing. This is a set of two blue security alarms. Please refer to the attached photos for size, usage, etc. Although they are new and unused, in the unlikely event that I send you the wrong item, or an item with scratches or stains that make it seem not new, I will accept returns and cancellations. They will be shipped via mail service. Delivery to your mailbox will take 2-7 days from the shipping date.