I feel like it's a bit lacking in strength, but if it fits without adhesive and is specifically designed for the neck, it might be light and good.

It is a cost-effective product.
However, since the pad material is metal, gel is essential.
Those who say the product is weak are not using the gel properly.
That's correct. If you apply the gel to the pad and then proceed to step 2,
It's quite strong.
Other than that, the product button is too small which is a drawback, and the heating has three levels.
The pad is made of metal material, so it heats up quickly. (Battery consumption may be fast
Available

I bought it because the reviews were good, and it's hot and thrilling. I think I need to use it more to see the muscle relief effect. It seems that both necklace plates need to be connected for it to work properly. Pressing the power button long turns it on/off, short presses change modes (there seem to be two), and there are buttons for adjusting heating intensity plus or minus.

The adhesive on the finishing part is too noticeable, the charging port looks a bit weak, and one of the buttons requires pressing deeply with a finger. Overall, the quality is poor, but considering the price range, it's acceptable.

It's flimsy but good to use. When fully charged and at maximum stimulation, there's still 4 bars of battery left.
Only low-speed charging is possible, not high-speed.