IPX2 related to the IEC60529 rating which is
defined as:
The IP Code defined in international
standard IEC 60529 classifies the degrees of
protection provided against the intrusion of
solid objects (including body parts like
hands and fingers), dust, accidental
contact, and water in electrical
enclosures.[1] It consists of the letters IP
(for "international protection rating"[2],
sometimes also interpreted as "ingress
protection rating") followed by two digits
and an optional letter. The standard aims to
provide users more detailed information than
vague marketing terms such as "waterproof".