if you would want to know more our products,pls search richsound in the google to find our website
We could supply all kinds of earphones with packing,

Resistance: 16ohm+/-10% Rated Impedance: 17ohm+/15% at 1Khz Sound Pressure Level(SPL): 100+/3 dB SPL at 1KHZ 1mW Resonance Freq (F0): 220Hz+/-20% at 1mW, free field Frequency response: F0 to 20 KHZ Different between L& R: Within 3DB at 1KHZ THD: less 2%@ 1KHZ, -15dbrms, < 5%@1KHZ, -6dbrms Rated input power(20Hz to 20KHZ): 3mW Maximum input power: 5mW