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DTMF (Dual-Tone Multi-Frequency) is the technology behind the familiar keypad on telephones and many communication systems. Each DTMF key corresponds to a specific pair of frequencies—one high and one low—that are transmitted when you press a button. For example, pressing the '5' key generates tones of 770 Hz and 1336 Hz simultaneously.

The standard DTMF keypad consists of 12 keys: digits 0–9, plus '*' (asterisk) and '#' (octothorpe). Some systems also support four additional keys: A, B, C, D. When a user presses a key, the unique frequency pair is decoded by the receiving device to determine which key was pressed, enabling actions like navigating phone menus, entering passwords, or controlling automated systems. dtmf key

Despite the rise of digital interfaces, DTMF keys remain widely used in IVR (Interactive Voice Response) systems, remote control via phone lines, and even some two-factor authentication methods. The standard DTMF keypad consists of 12 keys: