a. USB: charging function, charge the built-in lithium battery through the USB cable, and it takes about 60 minutes to fully charge.
b. Switch: OFF for shutdown, ON for startup.
c. Recording button: Press and hold for 1 second with a "beep" to start recording. The button can be released during the recording process. Press the button again during the recording process and stop recording when you hear "two beeps".
d. Charging indicator light (red): The red indicator light is on during charging, and the light is off when fully charged.
e. Play button: Press it to play the recorded audio once.
f. Blue indicator light: The blue indicator light flashes at a frequency of 1 second during the recording process, and is always on during the playback process.
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