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Set up and use Bluetooth accessories on iPhone - Apple Support
https://support.apple.com/guide/iphone/bluetooth-accessories-iph3c50f191/ios
Play audio from iPhone on a Bluetooth audio device. On your iPhone, open an audio app, such as Music, then choose an item to play. Tap , then choose your Bluetooth device. While audio is playing, you can change the playback destination on the Lock Screen or in Control Center.
iPhone 4 & Bluetooth Audio A2DP - Apple Community
https://discussions.apple.com/thread/2551542
Question: Q: iPhone 4 & Bluetooth Audio A2DP More Less. Apple Footer. This site contains user submitted content, comments and opinions and is for informational purposes only. Apple may provide or recommend responses as a possible solution based on the information provided; every potential issue may involve several factors not detailed in the ...
iPhone 4 - Technical Specifications - Official Apple Support
https://support.apple.com/kb/SP587?locale=en_US
Frequency response: 20Hz to 20,000Hz. Audio formats supported: AAC (8 to 320 Kbps), Protected AAC (from iTunes Store), HE-AAC, MP3 (8 to 320 Kbps), MP3 VBR, Audible (formats 2, 3, 4, Audible Enhanced Audio, AAX, and AAX+), Apple Lossless, AIFF, and WAV. User-configurable maximum volume limit.
Stereo Bluetooth Headsets for iPhone 4 - Tech Spirited
https://techspirited.com/stereo-bluetooth-headsets-for-iphone4
A word of caution regarding stereo Bluetooth headsets paired with an iPhone 4. The iPhone 4 does not fully support AVRCP (the Audio/Video Remote Control Profile). This feature provides advanced music controls like skipping tracks, shuffle and browse. But in the iPhone 4, it is limited to play, pause and stop.
Bluetooth 4.0 support and iPhone 4 - iLounge
https://www.ilounge.com/index.php/articles/comments/bluetooth-4-0-support-and-iphone-4
The iPhone 4 uses a single-band Broadcom BCM4329 chip for Bluetooth the 2.1 + EDR specification and 802.11b/g/n Wi-Fi. This is also the chip used in the third- and fourth-generation iPod touch, with a dual-band version used in the iPad, iPad 2 and second-generation Apple TV to provide 5Ghz Wi-Fi in additional to the standard 2.4GHz band.
How to enable aptX (HD) Bluetooth audio on your iPhone ...
https://darko.audio/2017/12/how-to-enable-aptx-hd-bluetooth-audio-on-your-iphone-ipad/
iOS users: forget about aptX (HD) – for now at least it remains irrelevant to your Bluetooth headphone needs. Instead, seek out AAC in your headphones’ specification sheet. Spying ‘Bluetooth 4.x’ is not enough. You’re looking for explicit mention of AAC support.
Does iPhone 4 have Bluetooth 4.0? - Apple Community
https://discussions.apple.com/thread/5967101
Question: Q: Does iPhone 4 have Bluetooth 4.0? More Less. Apple Footer. This site contains user submitted content, comments and opinions and is for informational purposes only. Apple may provide or recommend responses as a possible solution based on the information provided; every potential issue may involve several factors not detailed in the ...
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