Function keys, 0 tone key, 0 shift key – Kenwood TM-521E User Manual
Page 9: 0 rev (reverse) key, With the tm-221a/321a/421a/521a), With the tm-221es/421es/521e), 0 scan key, 0 alert key (tm-221 es/421es only), 0 alt key (tm-521e only), Display panel
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