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Technical specification
       >>Mini wireless earpiece (305 earpiece) receives signal by inductive coil, across electromagnetic fields
       >>Receiving distance: 50-70 cm
       >>Standard Zinc-air battery: type SONY 337
       >>Battery life: about 5 hours
       >>Audio bandwidth: from 300 Hz to 4 KHz
       >>Distortion: <2%
       >>Size: 3x5x7mm
       >>Working frequency: all frequencies
     
Inductive loop (Work with cell phone)
The inductive loop which is used in conjunction with earpiece is one of the mobile phone!s accessories.
Its work principle is the same as one-wired mobile phone inductive loops.

How to use:

Wear the skin color loop on your neck or under your close if necessary. Connect the port with your cell phone and talk to the microphone just like an
normal handsfree set but totally with no wire apear.