Model# Meeteasy GSM MINI-B

3 built-in microphones can be controlled separately
PSTN telephone line connection
DSP noise and echo cancellation
USB and analog interface for high-quality audio calls on PCs or laptops
Large loudspeaker for rich, clear conferencing or audio playback
Bluetooth built-in
Support GSM SIM card for mobile wireless calling 
Suitable for mid-large size conference

Product Specification/Models
Ports:
USB Port , RJ11 telphone jack
Speaker:
Response frequency: 200---4000Hz
Volume: max 85db
MIC:
Response frequency: 200---4000Hz
high sensitivity omni-directional microphones