1) one call button at each station 2) one LED display unit how it works? when someone need service, ge/ she can press the button, the number will be sent to the LED display.
Beijing Yueqi Science & Technology Co., Ltd., headquartered in Beijing, is a leading supplier of calling systems and a high-tech enterprise integrating independent R& D capacity, independent....
Transn Information Technology Co., Ltd. An Exclusive Multilingual Partner for the Official Website of the Chinese Olympic Committee 1. Corporate Profile Transn Information Technology Co., Ltd. is a....