1 . Average working voltage: 2.5 V

2 . Sound pressure level: 87dB @1kHz

3 . Impedance: 8 ± 5 % Ohm

4 . Frequency: 150-5000Hz

5 . Rated input(W): 0.5W

6 . Max input(W): 1 W

7. Size: 16.1*6.5mm

Used for bone conduction headphone, bone conduction masks, medical facilities and other products