Sony Headphones, Sony WH-CH520, Wireless On-Ear Bluetooth Headphones with Mic, Upto 50 Hours Playtime, DSEE Upscale, Multipoint Connectivity/Dual Pairing, Voice Assistant App Support for Mobile Phones (Blue) - ShoppCart
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How to use your Sony WH-CH520 Wireless Headphones | Sony United Kingdom
How to put Sony headphones in pairing mode
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How to connect my Sony Bluetooth Headphones or Earbuds - pairing procedures explained | Sony UK