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Reviews around pitch (1.00 of 5)
USB Wall Charger, AILKIN 3-Pack 2.1A Dual Port USB Plug Power Adapter Charging Cube Replacement for iPhone X 8/7/6 Plus SE/5S/4S,iPad, iPod, Samsung, Android Phone, and Other Charger Brick Plug-Blue
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One of them makes a loud high pitch noise
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In a quite room, I can hear the faint high pitch switching of the IC circuits in the plug.
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Two out of three have a loud high-pitched noise that is quite annoying
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They made high pitched squelching and crackling noises when plugged into an outlet
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