A surveillance camera has a housing, a photographic lens installed in the housing, and an adjustment mechanism connected to the photographic lens. A plug member is inserted into the positioning hole and projects from a base plate. According to the classification of the received packet, the router associates one of the plurality of forwarding tables to the packet. The PVDF material comprises a wearable form factor, whereby the transducer utilizes different properties of different materials and combines them into a common transducer.