I am selling a new Trimble 450-470mhz internal radio PN-53620-46S. This radio is brand new and factory sealed. The Unit will NOT transmit (NO TX). These are intended for rover’s only. This radio will work in a 5800, R8-2, R8-2, R8-3 , R6-1, R6-2 and R6-3. Again, these will not Transmit (no base functionality). These are RX only. If you need them programmed with a specific frequency file please let me know ahead of time. Ask question’s before buying.