Ultrasound Cavitation Technology is Silent The device operates at a 40kHz frequency, which is beyond the range of human hearing. This means you may not hear any noise, but the cavitation function could still be working properly. RF Heating Sensation Varies by Individual The RF (radio frequency) function gradually warms up the skin, but some users may take longer to feel the warmth. To ensure effectiveness: Make sure your skin is clean and free from oils or skincare products that might block energy transfer. Apply a sufficient amount of gel or serum to enhance conductivity. Keep the device in full contact with your skin and move it slowly for optimal heating. Check Your Settings Ensure the device is turned on properly and set to the desired mode and intensity. Try increasing the energy level to see if you can feel warmth or a slight pulsing sensation. Troubleshooting Make sure the device is fully charged or properly connected to power. Try testing on a different area, such as your arms or thighs, to check if the device is working. If you have tried these steps and still experience no effect, please contact Freyara customer support for further assistance.