You will need this registration if you intend to protect the visual appearance of products you have manufactured.
A registered design gives you a legally enforceable right to use your product's design to gain a marketing edge. It also prevents others from using the design without your agreement.
Design includes the shape, configuration, pattern or ornamentation that when applied to an article gives it a unique appearance.
Design registration is intended to protect designs which have an industrial or commercial use. Designs which are essentially artistic works are covered by copyright legislation and are not eligible for design registration.
The protection you receive is only for the appearance of the article and not how it works.