The present disclosure is drawn to compositions and methods for a liquid electrophotographic ink printing. Passengers having computers can connect to the network using their own conventional network connection cables. Methods of identifying if an individual has a genotype containing one or more mutations in the CFTR gene are further provided. Therefore, the cover member and the rear cap of the global positioning system can be replaced respectively by one own according to a user’s needs and preferences, to match color and shape of the global positioning system to be used.