1. Micro computer control system 2. Verify Real / Fake coins 3. Enact tariff rate 4. Enact free dial numbers 5. Enact barred dial numbers 6. Limit dialed number digits 7. Build-in auto IP dialer 8. Auto/Manual charge mode selection 9. Tone Dialing 10. PTT/PBX mode selection 11. 16-digit dot-matrix backlight LCD display