I bought these to fit in the inexpensive NRR 23 headphones, they work very well! The sound quality is very good for phone calls and intercoms, good enough for listening to podcasts, audio books or music. They connected to my iPhone without any problems. and control buttons are easy to find and operate when wearing gloves. It's a little fiddly to pair them together to use the intercom, but I finally figured it out after going to the FODSPORTS YouTube channel to watch a video about this particular headset model. I needed a set of ear defenders with intercom that I could use indoors while driving a Lotus Seven Roadster with a passenger or attending noisy events. (NHRA Drag Racing etc.) If FODSPORTS would release official NRR 23 or NRR 26 headphone sets with built in bluetooth/intercom electronics I would buy sets for everyone I know! (Especially if they were NRR 26)
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