HP Pavilion x360 Convertible PC (model numbers 15-bk100 through 15-bk199 and 15-bk000 through 15-bk099) - Maintenance and Service Guide

Item Description Function
(3) Serial number (s/n) This is an alphanumeric identier that is unique to
each product.
(4) Warranty period This number describes the duration of the warranty period
for the computer.
Locating the model number, product number, serial number, and warranty information 15