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4. OPERATION AND DISPLAY INTERFACE
1.Data display(see 4.1)
2.Indicator light
3.Function keys: from left to right, menu key/buzzer key/back key/confirmation key.(the function keys
have one-to-one relationships with the key symbols on the display.)
4.Rotary button：They can be used to select function items on the display by rotating the button and
confirm the selection by pushing the button.
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