It can quick check telephone line fault with high safety & multi-functions capability.

1. Telephone line fault checking

2. ISDN/ADSL identification

3. Hand free function (two speak ways, loudspeaker)

4. Calling number displaying

5. One Key override lockout function

6. Tone/pulse function

7. High voltage alarm

8. Low voltage warning, automatic power off and energy-save design

9. Memory key (10 groups of 18 digits)