Features: 1) Types: a) Self drive (general type) b) Self drive (thin type) c) External drive (general type) d) External drive (thin type) 2) Resonant frequency (kHz): 6.5±0.7 3) Static capacitance: 15,000PF 4) Resonant resistance: ≤300Ω 5) Input voltage: 30Vp-p square wave max. 6) Current consumption: 3mA max. 7) Plate material: copper 8) Operating temperature: -20oC ∼ +70oC 9) Storage temperature: -20 ∼ +75oC