How do I turn the X Talker T50 Series on and off?

Press the POWER/MENU button for at least 3 seconds to turn the radio on or off. During power on, the radio will beep 2 times with different tones, the LCD will display several icons for 1 second, and then show the last channel selected.

From the official Midland X Talker T50 Series manual, page 7

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