Model Number: EFH8540T Brand Name: Deli Key Specifications/Special Features: Model number: EFH8540Rated voltage: 3.6VOperating voltage: 2-5VMax.Rated Current:90mAMin.Sound Pressure Level:85dB/10cmCoil Resistance(DC):16+/-3ohmResonant frequency: 2400HzOperating temperature: -30 to +70°CWeight: 1gModel number: EFH8540ARated voltage: 3.6V
Operating voltage: 2.5-4.5V
Max.Rated Current:80mA
Min.Sound Pressure Level:88dB/10cm
Coil Resistance(DC):16+/-3ohm
Resonant frequency: 2700Hz
Operating temperature: -30 to +70°C
Weight: 1g

Model number: EFH8540B
Rated voltage: 3.6V
Operating voltage: 3.0-4.5V
Max.Rated Current:100mA
Min.Sound Pressure Level:90dB/10cm
Coil Resistance(DC):16+/-3ohm
Resonant frequency: 3000Hz
Operating temperature: -20 to +60°C
Weight: 1g