The oval-shaped plastic case is produced through the process of precision one shot injection molding using ABS engineering plastic material. It has an integrated snap fit structure, slot for positioning, screw bosses and reinforcement rib inside. It can be assembled reliably with the snap lock and screw fixing system. The external surface is coated with the matte fine finish texture which provides anti-scratch and non-fingerprint effect. It is widely used as an outer case for wall mounted smart devices.