NEC DTL-6DE-1 - DT310 - 6 Button Display Digital Phone - Page 47

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8 Melody 4
9 Melody 5
10 Melody 6
Note:
Tone number 5, 6, 8~10 (Melody 1, 2, 4~6) will
sound continuously.
No. Frequency (Hz) Modulation (Hz)