The 'Essentials' license for nonprofits covers everything you need for accessing Business Central and all the functionality included in Launchpad. 

NOTE: Customers ordering products designated for nonprofit organizations through the CSP program must first establish a tenant with Microsoft. Nonprofit customers who have not already done so are required to go through a quick registration process at  www.microsoft/nonprofit . Once they are approved, they will be assigned a nonprofit tenant and will be eligible to purchase nonprofit designated products.   

Dynamics 365 Business Central can be accessed from your phone, tablet or PC. Every user who wants to write to the system (so anyone who wants to post invoices, journals or any sort of transaction) will need a license.

This is a monthly recurring subscription with a minimum 1 year term.