Wulian Wireless Doorbell Button/Emergency Button

Wireless Doorbell Button/Emergency Button is based on ZigBee/SmartRoom techonlogy.
When someone presses the doorbell button, you smart phones will receive messages wherever you are so that you won't miss any visitors.
When it is treated as emergency button, the elder or children can take it with a ling.
Alerts can be triggered once the emergency button is pressed and family members can receive messages from smart phones,and deal with emergency in the first time to save life and protect home security.