Devices, systems, methods, and other embodiments associated with an optical movement sensor are described. In one embodiment, the circuit is used to alter the drive applied to a sense amp’s voltage-pulling transistor, thereby allowing modification of the voltage-pulling rate for components of the sense amp. A method of delivering one or more therapeutic agents to the female urinary tract, the method involving insertion of the urethral suppository into the urethra. The single service provider acts as a reseller of other network services and provides a customer with a single source for billing purposes. When the polyester, polyamide, or acrylic fiber yarn is stronger than the fluoropolymer yarn, the yarn of such fiber strengthens the yarn blend.