Bluetooth 4.1 will bring more reliable, automatic connections, multiple roles, & more via software update - 9to5Mac
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Bluetooth 4.1 Receiver and Transmitter, 2-in-1 Wireless 3.5mm Audio Adapter,Built-in Mic for Hands-Free Calling in RX Mode - Walmart.com
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Bluetooth 4.1 Audio Transmitter Module Board Kcx_bt_emitter Stereo Usb Sound Card Wireless Transfer To Speakers Headphones - Integrated Circuits - AliExpress
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10pcs Car Speaker Amplifier bluetooth 4.1 Audio Receiver Module Modification Accessories Motherboard Stereo
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