Remove echoes and restrain noises Using DSP
Support A2DP(Bluetooth Stereo HeadstetProfile)
Support TTS(Text To Speech)
It has a function to remove echoes and restrain noises Using DSP (Digital signal processor) which provides the high call quality Moreover, you can enjoy clear music and Hands Free phone calls even in a noisy environment using the Music devices which support A2DP (Bluetooth Stereo Headset Profile) such as a mobile phone device, PMP or i-POD through the body of MNA-9 or cars' audio systems which are taken FM transmission methods. Moreover, supporting TTS (Text To Speech) which let you know the condition of the device, even though you don't check the LED, you can notice the condition.
Bluetooth

Version

   v2.0/CSR BC 5MM

Tx Power

   Class II (10m W)

Rx Sensitivity

   -78dBm

Frequency

   2400~2483.5MHz

RF Modulation

   GFSK / PSK

Audio Modulation

   PCM / CVSD

Data Rate

   1Mbps / 2Mbps / 3 Mbps

Support for 802.11

   Co-existence

Support Profile

    - Hands free, hands free set, stereo audio, remote control
FM Transmitter

Frequency

   88.1MHz ~ 107.9MHz

Frequency step

   0.1MHz

Frequency find

   Auto and manual

Auto off

   Yes - based on EU requirement

Audio Frequency

   100Hz ~ 15KHz

Tx power

   48dBu V/m@3m

Band width

   200KHz
MP3

Keys

   Play/stop, forward, backward
Audio

Speaker volume level

   10 steps

Speaker watt

   2Watt, 36mm Diameter

Microphone sensitivity

   -34dB +/- 3dB
LED

Power(Connected/Low battery) LED

   Talk LED, FMT LED, Changing LED
Speech time

Up to 18 hours by using FM transmitter

Up to 14 hours by using speaker
Stand-by time Up to 280 hours
Charge time

3 hrs by cigar-charger

33 hrs by solar-energy