Hong Kong Conference Speaker Phone

Specifications: Model CP20 conference speaker phone made in China by ISO9002 mauafacture of Hong Kong and it has been hight quality, specefication as following: Line Type: Analog PABX/PSTN Power Source: 230V/115V AC, 50Hz Power Adapator Input: 12V DC 800mA/9.6VA Volume Control Range: -18 dB ~ +12 dB Ringer Volume: 70dB (A)(Max) Telephone Line Out Impedance: 600 OHM On hook Current: 6uA Loop Resistance: 400 OHM Talk Transimission Distance: within 3 meter Talk Receiving Range: within 30 meter square