Four small telephone switch with sixteen 

 Outside of the switches can extend into four sixteen telephone extensions, allowing the use of all the extensions from each other and quit at the same time 
 Interference. Call quality is not outside the distance limit, no matter how much access the bureau will not cause any extension 
 Impact. Extension can be telephones, fax machines, answering machines and computers of any telecommunications, extension itself 
 Intrinsic function is still valid. This switch provides two kinds of computer and manual shift mode, the computer means duty 
 Where you can be your own telephone number, name or unit name of the input switch, suggesting that foreign, to establish the company 
 Image, improve efficiency, savings in staff costs purposes. Improved anti-jamming, anti-lightning and theft fight 
 Performance, the power to adapt to range up to 180 volts to 240 volts, to adapt to harsh environments. Beautifully thin design, with 
 Various working status indicator, so that it elegant, second to none. The switch features a powerful performance 
 Excellent, easy to use, is the ideal family unit and expansion of telephone equipment.