Call Mouse- Wireless Networking, When customer push button the signal will go through Service Station, That we have special digital monitor design. The monitor will show number before and after called. - With the big digital monitor you can see it clearly. - We have many model, difference design & Modern design, You can choose to suit your business (Restarant, Cafe, Japanses-Restaurant, Karaoke, Golf-Field, Blowling Center, Ect) - Easy to install, Signal will be between 30-200 M.- Import from Korea. - 1 year Warantee.