1, must be wireless FM headphones, must be able to receive campus FM signals.
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2, must have a frequency display function, display the current received frequency modulation signal frequency.
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3, clear sound quality, high sensitivity.
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4, the volume is adjustable.
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5, shutdown can be used as a wired headset, connected to the active audio or earplugs.
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6, a certain anti-noise, noise reduction design.
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7, easy to carry
I personally think that the level 4 headset is still relatively high wired, less noise, relatively high sound clarity, effective headset signal reception ability is particularly strong, is suitable for the Level 4 exam special equipment.
Wireless good. Strong signal reception ability, convenient.