DUALSONIC Professional cartridge can be used to reduce fat and improve body contours. This cartridge contains 60,000 shots of 20 dots/ shot. It can work on the depth of 6.0 mm, 7.5 mm or in DUAL mode, which is simultaneous treatment of both 6.0 and 7.5 mm depth. This body cartridge can be use only with upgraded version of DUALSONIC Professional set, sold from August 2021. If you have older versions of DUALSONIC Professional you can send your product to manufacture for upgrade. The body cartridge was launched later then Professional version thats why it has its own separate cartridge package. Please, note that you need to ensure that your device will be compatible with this Body cartridge. Its better to check your device serial number before you make purchase. Contact us for your assistance by email (overseas@jionmeditech.com) or Instagram @dualsonic_global. Thank you in advance!