For **facial tightening and collagen support**, I would recommend the **FacialDefy 3.0** if you want a more comprehensive treatment. It combines **HIFU + RF + Red LED**, so you get deep HIFU lifting together with RF warming/firming and red-light support in one system. The **FacialDefy 4.0** is a better choice if your priority is more advanced HIFU treatment with multiple depth cartridges and deeper facial/body contouring. So in simple terms: **3.0 = better for multi-technology facial rejuvenation** **4.0 = better for advanced/deeper HIFU lifting and contouring**  

This device does not require you to set a specific temperature in °C or °F. The RF function has adjustable energy levels and normally creates a gentle, comfortable warming sensation, while the HIFU function delivers focused ultrasound energy below the skin. We recommend starting at a low level and increasing gradually based on your comfort. As long as the treatment feels warm and comfortable—not hot or painful—this is generally normal. 

We apologize for the conflicting information. For this FacialDefy 3.0 model, HIFU, RF, and red LED can be used together during the same treatment. They can also be switched on separately according to your skin’s comfort and treatment needs. The correct answer is that all three features may be used together, but it is not required. Please start at the lowest intensity and use sufficient conductive gel.  

A “shot” means one activation of the HIFU probe, not one treatment session. When you press and hold the treatment button, the probe continues operating and this counts as one shot. If you release the button and press it again, another shot is counted. Therefore, 20,000 shots does not mean exactly 20,000 sessions. One session may use one or several shots, depending on how many times you stop and restart the probe. Each probe has a total capacity of approximately 20,000 shots and should be replaced once the counter is used up.  

The cartridges do not need to be replaced after a certain number of treatments. Each cartridge is rated for approximately 20,000 shots. Once the cartridge reaches its shot limit, it should be replaced. How long a cartridge lasts depends on your usage frequency. For most home users, a cartridge typically lasts many months before replacement is needed. 

No, you need to hold down the button while using it. 

HIFU 3.0: Each probe can be used 20,000 times. If you need one, you can purchase a replacement probe under the HIFU category. 

Hello, yes, it is compatible. 

You understand correctly. It can be used a total of 20,000 times. After that, the probe needs to be replaced. It can be found under the Beauty Instrument category in the HIFU Instrument section. 

An eye probe is used near the eyes and can be placed on the eyelids or under the eyes.