Product Name: 8.5*8.5*3mm Square SMT Magnetic Buzzer External Buzzer Model NO.: SMT8503 Brand: Saipwell Certification: ISO9001, CCC, CE WORD nChannels: 7.1Channel Usage: Expand Volume Radiation Mode: Direct Radiation Type Style: In-ear Transducer Principle: Electrostatic Earphone Cone: Polypropylene and Titanium Edge Transmission Mode: Bone Conduction Category: Buzzer Brand Name: Fbele Model Number: SMT8503 Type: Buzzer Rated Voltage: 3.6V Operating Voltage: 2.5-4.5V Rated Current(Max.): 90mA Min. Sound Output: 85dB Coil Resistance: 16