The TK-2170/3170 provides loud, clear audio even in noisy environments. The convenient 128 channel/128 zone capability accommodates virtually any current or future capacity requirement for single or multiple site radio systems. The TK-2170/3170 is built to survive the hard knocks, drops and all weather environments of its users. It meets or exceeds the stringent IP54/55 dust and water intrusion standards and the MILSTD 810 C, D, E & F environmental standards including the demanding "driven rain" test.