赤せき外がい線せん通つう信しん

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Meanings

1

noun

infrared data communication

Technical term for data transmission using infrared light, commonly used in older mobile phones and remote controls.

外outside

線line, track

通traffic, pass through, avenue

信faith, truth, fidelity

赤せき外がい線せん
Refers to infrared rays themselves, not the communication method.
Bluetooth
A more modern wireless communication standard, often replacing infrared in consumer devices.

Compound of 赤外線 (infrared rays) and 通信 (communication).