Disposable heating packs may make noise during the heating process.
This is because the principle of this heating pack is to release heat through chemical reactions, and this process is usually accompanied by the production of some gases and liquids, which will produce sound when they are discharged.

In addition, if the heating power does not match, it will cause unstable current and cause noise.
At the same time, poor use environment may also affect the quality and service life of disposable thermal efficiency, thereby causing certain noise problems.
In general, when using disposable heating packs, you need to pay attention to safety and operate them correctly to ensure that they work normally without making unnecessary noise.
The above content is for reference only. The final result should be based on the actual situation.