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Product Name: Hot Sale High Quality Magnetic Buzzer Electromagnetic Buzzer Model NO.: FBPB1478 Brand: Saipwell Certification: ISO9001, CCC, CE WORD nChannels: 7.1Channel Usage: Monitor Radiation Mode: Direct Radiation Type Style: Head-mounted Transducer Principle: Electrostatic Earphone Cone: Paper Cone Transmission Mode: Bone Conduction Category: Buzzer Brand Name: Fbele Model Number: Fbpb1478 Type: Piezo Siren Buzzer Product Name: Electromagnetic Delivery Detail: 15days Rated Voltage: 12vp-P Square Wave Max.Allowable Voltage: 30vp-P Square Wave Resonant Frequency: 4.5