A system and method for selecting and presenting advertisements based on natural language processing of voice-based inputs is provided. The protective cap is mounted on the distal end of the endoscope providing a protected surface for retaining the stent. The threaded median portion has a core, which is conical, with a diameter becoming increasingly larger from the distal end of the threaded median portion to the proximal end thereof, and thread, which has a constant diameter smaller than the diameter of the thread of the proximal threaded portion. The switch device determines an extent of displacement of the actuator and comprises a contact element positioned for contact with the actuator; and processing circuitry for detecting when the actuator makes contact with the contact element. Implanting dopants to form a drain contact using a second edge of the first region as a mask to define a first edge of the drain contact, wherein the distance between the top gate and drain contact is defined by the lateral length of the first region. The LED driving circuit structure is installed on an LED light circuit board having a plurality of LEDs mounted thereon.