Methods and apparatus, including computer program products, implementing and using techniques for intelligent two-way telemetry. A method for signaling the presence of a user comprises providing a structure having first and second opposite reflective sides being adapted to removably attach to clothing, removably attaching the structure to clothes worn by the user and reflecting light from the structure. The metal connector comprises a base member, rafter tabs, spacer webs, sheathing tabs, and gussets. Each speaker driver may be driven by an electrical signal having a respective amplitude that is a function of the speaker driver’s respective location on the mounting plate. The hose has a body with a mechanism for damping pressure pulsations within the fuel rail assembly.