"Reading some of the other reviews, one of the first things I did was to glue the cord in place using hot glue. I wouldn’t necessarily recommend super glue. My thought process is hot glue can also act as a sealant. I also applied hot glue to the gold ring area. If any lube or moisture was getting into the device, that would be the spot. So after sealing my heating rod, I was fairly confident I could use it with lube safely. I have 3 Tenga Flip Holes and a Flip Zero. What I do is apply lube, then seal them up with the heating rod inside. The rod is fairly slow to heat. I used it with a weak USB charger at first, but the charger was getting hot. I was concerned about that, so I was monitoring it. You can’t create heat without a good amount of power. If you’re going to use one of these, you should be cautious about what type of USB charger you’re using to power it. What I ended up doing was buying an 18 watt USB charger. It handles this thing no trouble whatsoever, it was only $7, but on sale fortunately. It seems to actually allow the rod to heat more quickly as the low power charger is no longer acting as a bottleneck.
So it does work like it supposed to. The only downside is you really need to prepare ahead of time now. You have to get everything out and let it sit for 15-20 minutes. The rod can actually get everything too hot. So you need to kinda use trial and error to determine exactly how long to wait before removing the rod. I’ve actually been wanting something like this for quite some time, so I’m glad I finally got something that works, as using alternative methods to heat either lube or your toys can be problematic. If you’re like me, and immersion is an important factor in your activities, then this will take your game to the next level. This rod, a good toy, I recommend checking out Tenga toys and lube, a VR headset, and plenty of VR content, it’s about as close as you can get to the real deal without spending inordinate amounts of money."

"This product works as advertised. I can plug it in an hour before activities and it warms the sleeve nicely, never overheating. However, cheap construction caused the wire to pull out. I only got to use it twice. You may be better off paying a bit more for a higher quality warmer."

"The warmer works well and is fairly quick. Easy to clean and store. The only down side is the permanently attached short cord. If it had a USB-C end it would be five star, or if the attached cord were ten feet instead of six. Worth the money despite the cord."