Undesirable transistor leakage in transistor structures becomes greatly reduced in substrates having a doped implant region formed via pulling back first and second layers of a process stack. Radial bearing sleeves are positioned between the inner mandrel and the outer housing at both of ends of the outer housing. The VHT signal field is distinguishable from other signal fields, wherein the VHT signal field allows for a backward compatibility with other devices. The progressive heart rate monitor display can include a numeric display for representing the heart rate as a numeric value.