Specifications include, but are not limited to: 2.1 The TWC code control boxes shall be Part No. HK 44 505 024 (PAAC Stock No. 146393), as manufactured by Hanning and Kahl, or "Approved Equal.", 2.1.1 The TWC code control boxes shall be capable of interfacing with the Authority’s cab operator’s control panel. TWC code control boxes shall be provided as ready to install into the cab operator’s control panel without modifications to the panel or the control boxes provided. Switch functions, system operation tests and route telegram codes shall be in accordance with the system characteristics and requirements of the attached TWC Equipment Manual, including but not limited to, pages 41- 47. 2.1.2 Pushbuttons and thumbwheel switches for transmitting setting commands shall be mounted on the front panel of the TWC code control boxes. 2.1.2.1Pushbuttons mounted on the TWC code control box front panel shall be designated “START” and “CANCEL” and shall be LED illuminated. 2.1.2.2Three-digit thumbwheel switches shall be used for setting the route number.