PURPOSE：

For the one-way   broadcast, two-way intercom and monitor in the main control room

FEATURES：

1.   A professional composite shape of paging microphone,   with a TFT color screen, a 20-key board and an indicating light.

2.   Adopting high-speed industrial chip with a start-up time ≤1second.

3. Available to broadcast towards   different partitions and a red indicator will be automatically turned on at   the beginning of the talk;

4. With a built-in 3W speaker and a   microphone to talk and monitor in two-way;

5. Support to display the Chinese   and English name of the outgoing calls and incoming calls for identification;

6. To trigger the flashing of the   external alarming light on the specified terminals;

7. With audio line output interface   which can be connected to active speaker.

8. With audio line input interface   which can be connected to external audio sources for broadcasting to target   terminals.

9.   With NAS-8502L expansion board (maximum cascade of 16) and each expansion   board has 8 shortcut keys for option（each shortcut key name can be   customized for broadcasting to specified areas or designated terminal）.

10. With the   function of initiating and receiving a call without IP intercom server；

11. With a standard RJ45 interface supportive of crossing network segment and router, accessible to the system if the Ethernet is available.

NAS-8502(NAS8502B +   NAS8502L)