TL:DR - These are an improvement from the Runner Pro2s, but they don't last. I can only hope that the newer Runner Diver2 Pros have made improvements, but after having two different Nank headphones malfunction and/or break on me in the span of 15 months, I'm switching to Shokz.

Update from 11/14/2024:

I've had these for barely over a year, and they're even more broken than they were in May (see below), and mostly dead. For the last couple of months, at least once during each hour-ish pool swim, the headphones would just stop. Not turn off. The music just stopped. Wouldn't shuffle back or forwards. I would have to turn them off, back on, back into storage mode, and try again. Sometimes it worked/played normally. Other times it would only play the same song again, before stopping, again.

Adding to that, one ear piece snapped back in May, and the other snapped this week. Both broke while I was wearing it, so I have no idea how. The left speaker now no longer works either. As for the right earpiece, I repaired it with a piece of a coated paperclip and electrical tape. The right speaker is still working.

The chlorine must finally be getting to the rubberized coating too, because just sliding it back to expose the broken area caused several tears in the coating. I wrapped that in electric tape too, but I can't imagine it's going to hold up for long.
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Update 5/1/2024:

One of the ear-pieces broke this week, while still on my head. I was putting them on before pulling down my swimcap, and I realized the left side just didn't feel right. I took them off to investigate, and the plastic beneath (at the top of the ear) had snapped in half. Fortunately, none of the wires were damaged, so I was able to piece it back together. I'm disheartened that, even with taking good care of them, they broke within 8 months of purchase.

Another issue: I wish it would stay in whatever mode you choose. If I don't turn my phone's Bluetooth off, the headphones will repeatedly switch out of storage mode and back into Bluetooth mode, which, of course, doesn't work in the water.
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Initial Review, November 2023:

I started with the Runner Pro2s & now have the Runner Diver2s. In pictures, the Diver2s are gray, the Pro2s are black.

I bought a pair of the Naenka (now globally: Nank) Runner Pro2 bone conduction headphones August 2023 after roaming the endless options on Amazon. I was looking for a pair of waterproof headphones with internal storage that I could use while swimming. I prefer earbuds and over-ear headphones for other things in my life and have found things I love. However, for swimming, I just couldn’t find something that ticked all of the boxes.

I uploaded some songs to the internal storage, and used them (the Runner Pro2s) for lap swimming for about 6 weeks (2-3 times/week, for around 90 minutes each time). I was happy with how they fit and functioned. However, the internal storage/drive then just seemed to vanish. They would no longer switch between Bluetooth and Storage modes. The computer would no longer recognize there was even a drive. They would still charge, the Bluetooth function still worked, but the internal storage was gone. The internal storage was the entire reason I had purchased them.

I reached out to the company, and they immediately messaged me back, saying that if I wanted to try the new Runner Diver2s, I could buy them off of Amazon, send them my order number for verification and my PayPal information, and they would reimburse me the cost, to make up for the failure of the Pro2s. Sure enough, I got reimbursed (and BEFORE I wrote the review too).

The Good:
- The sound quality is better than the Pro2s. The bass is cleaner.
- Initial battery life is better.
- There’s a new voice for the functions (“Power On”, etc.) and it’s more pleasing
- The outer coating feels luxe
- There is both a sequential AND a random play option for songs. This is a great update from the Pro2s, where you could only listen to songs in the order you uploaded them.
- The control buttons are in a more intuitive/ergonomic position.

The Odd:
- There was a price jump from the Pro2s to the Diver2s (~$100 to ~$170). Same 32g storage. Only 2 more hours of battery life. Little bit better sound. Seems excessive.
- The “size adjustment” cord is the same dinky piece of stretch-rubber used for the Pro2s.
- Nank threw in some “extras” with the Diver2s, but I’m not sure they really added anything.
- Proprietary charging cable, and different than the Runner Pro2s.

Room for Improvement:
- I wish it came with a carrying case. I would MUCH rather the headphones came with a carrying case instead of the ear plugs and “sound enhancers.”

The Nank app can not find the device.

I love it and it is exactly how it is described. But i would love for it to have abit more allowance for users with Big head width.

These were absolutely great for my sessions, these were my first bone-conducting headphones and delivery was quick and very easy to setup.

Im happy with it so far. Thanks for everything.