Proteus DX DX - WiFi Door Sensor WiFi Door Sensor Detects Door open/ close status and sends alerts by Email/ Text message. Connects to your home or office wifi. No hub or gateway required. No Monthly fees. Easy Setup Sensor switch is hardwired (not wireless) from door to the wifi base unit. 25 ft cable included. Programmable to normally open / normally closed modes. Works with doors, windows, cabinets and more