... easy operation and maintenance.2. Utilize European-style high-frequency high Q-value square resonators (oscillation barrels) 3 ... wave band 27.12MHZ 5. With high frequency stabilizer and high frequency magnetic leakage to avoid jamming 6. ... fit for welding PVC/PVC, PVC/card, special plastic material ( PE, EVA, PS, PC, PET ... stamp, logo, writing case, tous, plastic cover, cushion and packaging bag welding.