Difference Between Bluetooth 4.0 And 4.1 (Complete Guide)
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Bluetooth 4.1: what is it and why should you care? | Trusted Reviews
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Bluetooth 4.1 Audio Receiver with 3.5mm Audio Output - Special NFC Function - Transmission Range of 10M - On / Off Switch - LED Indicator - Black - Orico
Mpow Cheetah Bluetooth 4.1 wireless headphones review - The Gadgeteer
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