Product Name: Hot Sale Magnetic Buzzer 12*7.5 Fbmb1275 Model NO.: FBMB1275 Brand: Saipwell Certification: ISO9001, CCC, CE WORD nChannels: 6.1Channel Usage: Expand Volume Radiation Mode: Direct Radiation Type Style: Head-mounted Transducer Principle: Piezoelectric Earphone Cone: Paper Cone Transmission Mode: Bone Conduction Category: Buzzer Brand Name: Fbele Model Number: Fbmb1275 Type: Buzzer Rated Voltage: 3 Operating Voltage: 1-25 Max. Rated Current: 30mA/3VDC Min.Soud Pressure Level: 85dB/10cm Resonant Frequency: 3.1