This is the ultimate in UHF environmental transmission microphones. The microphone is supplied by the cell phone battery, thus being able to use the cell phone independently.

Even under deep scrutinity, the battery will not show anything that may alert another person. The UHF crystall transmitter can transmit at a distance of up to 200 m under optimum conditions. Ideal for any situation in which the cell phone may be forgotten or when the batteries must be removed, for example during a meeting. The microphone in the battery will go on transmitting when the cell phone is on, when the battery is removed and when it is charging. It will transmit environmental and cellular conversations to the receiver.

If you want to record, it is recommended to use the 5 hr. PANASONIC digital recorder.