Hello, The key difference between 40K and 80K fat-burning devices lies in the difference in ultrasonic frequency (40kHz vs. 80kHz), which directly affects penetration depth, focused energy, and applicable areas. Below is a detailed comparison analysis: #Core Differences:# 1. Features: 40K Fat Blaster and 80K Fat Blaster 2. Frequency: 40kHz (low-frequency ultrasound) and 80kHz (high-frequency ultrasound) 3. Energy Penetration Depth: 40K penetrates deeper (approximately 4-6cm), 80K penetrates shallower (approximately 1-3cm) 4. Energy Focus: 40K is relatively dispersed, 80K is more concentrated and precise 5. Applicable Areas: 40K is suitable for areas with thicker fat, 80K is suitable for areas with thinner fat or delicate areas 6. Pain: 40K is generally more noticeable (deeper effect), 80K is generally milder Summary 40K = Powerful, deep fat reduction (suitable for large areas) 80K = Precise, shallow body shaping and skin tightening (suitable for smaller areas) Practical Consideration: A single treatment will have limited results. Typically, 3-6 treatments (2-4 weeks apart) are required. Maintaining a healthy lifestyle is crucial for long-term body shaping.