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FCC issued warning Thurs. on displays by vendors to demonstrate c...

FCC issued warning Thurs. on displays by vendors to demonstrate cellphone accessory that includes flashing light on tip of antenna. Flashing displays are used to show what accessory looks like when it is activated. Display units, which have increased…

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in number in last year, send radio signals through several accessory antennas to make them flash, FCC said. Signals from display units cause interference on cellular frequency bands, which can harm cellular communications and threaten other services in nearby bands, FCC said. Devices that use radio frequency energy require prior approval from FCC, Commission said. There currently are no flashing cellular antenna displays that have received Part 15 approval, agency said. Vendors who are using these displays are advised to “immediately” turn off these devices, Commission said.