MaxIT MA007 Wireless Covert Inductive Loopset
The MaxIT MA007 wireless inductive loopset when used in conjunction with the MaxIT covert earpiece gives the user completely hands-free communication. Simply pair your Bluetooth® enabled cell-phone with the loopset and you are ready to receive and make calls without anyone but you knowing about it. Both devices are very simple to use and can be powered by regular, off-the-shelf batteries.
Download the MA007 user manual here

The MaxIT Covert Earpiece, detailed product description:
Dimensions: 3 x 5 x 7mm
Maximum volume output @ 3kHz: 93Db
General volume output 1kHz: 73Db
Frequency: 300Hz-5kHz
Distortion rate: <2%
S/N at 2KHz: >50dB
Receiving system: Electromagnetic Telecoil
Battery Type: Model # 337, SR416SW 1.5 volt Zinc Watch/Calculator battery
Battery longevity: up to 15 hrs
Weight (including battery): 0.8g