Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for deeper...

https://mike-wiki.win/index.php/Ultherapy_vs_RF_Microneedling_%E2%80%93_Which_Is_Better_for_Crepey_Skin%3F

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for deeper lifting, with results peaking around 3 to 6 months. RF heats skin to 40-45°C for collagen boost but works more superficially