Shan Yeun's line of quality products promise to provide a new level of security and privacy to our homes and businesses at affordable and highly competitive prices. Our product range includes: Quality pagers, Wireless door alerts and phone ring extenders, Emergency alert systems, call systems, Local pagers, All "4" callers, Vibration "two way" call systems, Dimmer control system, Human sensor, SOS tagging devices, etc. We have brought privacy and security technology to a new level of convenience and affordability. We have always been one step ahead. Shan Yeun's new wireless security and privacy system makes use of modular technology that allows for more convenience to the user. There are no AC outlets required and no wires to install, even our receiver units are battery operated and use security codes for further protection. In our world today where communication technology is erasing the line between public and private, it is good to know that Shan Yeun helps you define your boundaries.