Selecting a Body Machine (such as EMS, Cryolipolysis, or Cavitation devices) requires a focus on clinical efficacy and safety certifications. Buyers should prioritize machines with CE (Medical), FDA, or ISO 13485 certification to ensure compliance with international health standards. Key technical specs include adjustable frequency ranges, cooling system stability (for laser/cryo), and high-quality handpieces that can withstand 2,000+ hours of operation. Always verify the internal power supply stability to prevent voltage spikes from damaging sensitive electronic components.