Description Fixed Speed, Coaxitron®, Desktop The KBD9000 transmitter/controller is a low cost, compact, desktop keyboard designed to work with Coaxitron ® fixed speed receivers. It uses the standard mode (15-bit) Coaxitron protocol for fixed speed operation. If variable speed operation or preset positioning is desired, use an extended mode (32-bit) Coaxitron control, such as the MPT9500. – See more at: http://www.pelco.com/sites/global/en/products/analog-systems-controls/range-presentation.page?p_function_id=10501&p_family_id=10271&p_range_id=5522#sthash.E0IxJADc.dpuf