Model Number: EFS3923 Brand Name: Deli Key Specifications/Special Features: Model number: EFS3923Rated voltage: 12VDCOperating voltage: 6-15VDCMax. rated current: 80mA at 12VDCMin. sound pressure level: 110dB at 12VDC/30cmResonant frequency: 1.5-3.5 KHzTone nature: warbleOperating temperature: -20 to +60°CStore temperature: -30 to +70°CWeight: 35gN.W/G.W: 17.5/18.5kgsMeas/qty: 41.5*27.5*26/500 pcs