How do I lock the keypad to prevent accidentally changing settings?
Press and hold the CALL/LOCK button for 3 seconds to activate the Keypad Lock, and the lock icon will appear on the display. While the keypad is locked, the PTT and CALL buttons will still remain active. Repeat the same procedure to unlock the keypad.
From the official Midland X Talker T50 Series manual, page 9
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