Micro EarPiece Secret-Ear technical data

Micro Ear Piece Secret Ear receives signal, by inductive coil, across electromagnetic fields
Receiving distance: 50 70 cm (not for Bluetooth solution)
Standard Zinc-air battery: type 5 1,4 volt; type 10 - 1,4 volt or type 312 - 1,4 volt
Battery life: from 50 to 100 hours
Audio bandwidth: from 200 Hz to 4 KHz
Size: 12 X 6 X 5 mm.
Working frequency : ALL FREQUENCIES
Distance between inductive coil and secret ear: about 70-100 cm.
Ear-GSM kit with bluetooth collar includes:

Micro Earpiece Secret Ear
Bluetooth collar
USB battery charger