C. Controls Layout
1. Visitor call button
2. Door code entry keypad (keypad model only)
3. Low battery indicator
4. Call indicator
5. Front or back gate selector
6. Internal or external antenna selector
7. Power supply selector (older models)
8. Pairing button
9. Terminal block (gate connection, etc.)
10. Optional external antenna cable
11. Answer button (blue)
12. Hang up and power ON/OFF button (red)
13. Door lock open button
14. Press-to-talk (PTT) button
15. Microphone
16. Volume up button
17. Volume down button
18. Battery door lock button
19. Speaker
20. Li battery socket
21. Charging contacts
22. Charging indicator
23. DC jack
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