Don’t worry, this is normal. This type of ultrasound cavitation device doesn’t necessarily generate noticeable heat or vibration; some people can barely feel it. It works by using ultrasound beneath the skin, not through intense physical sensations. Sometimes you may experience: A slight warmth (or none at all) A very faint sound (only audible when you put your ear close to the device) You can perform a simple test: Hold the probe close to your ear; if you hear a faint high-pitched sound, it means the device is functioning properly. Remember to always use gel when operating the device to ensure optimal results. Translated with DeepL.com (free version)