Operation Temperature: -40oC -275oC PowerVoltage: ≥15KV Operation Power: ≤4Kgf Electromenchanical Coupling Coefficient: KPT=0.62 Relative Dielectric Constant: K33=1750 Piezoelectric Constant: D33=400×10-12 C/N Service Life: ≥10,000 Times Approval: CE