Wifi wireless communication; Retekess TH011 door alarms for home security can go beyond the distance limit and keep you in control of your families’ security anytime and anywhere APP remote control; with dual reminder of both gateway and smart phone; alarm information can be synchronized in real time; enable you to use anywhere and anytime; detector your parents' actual conditions Easy installation; install host flat on the desk; and can hang on the wall; the host extends to the wall; or can be hung by a lanyard; door sensor can be installed on the door or window; infrared sensor can be hung on the wall; easy to install and use Long distance between hosts and sensors; the distance between the host and sensors is >100m (open air); it can work normally if you put the sensors anywhere at home Ringtones and volume can be adjusted; door alarms for dementia have 32 ringtones and 5-level volume; volume adjustment includes silent mode; you can choose your favorite ringtones and volume as you like TH011 motion sensor alarm ensures the safety of your families especially the elderly; collocate with TH013 and TH015 infrared sensor and TH016 door sensor to use; after connecting to the network of receiving and sending terminal; message transmission is not limited by distance; alarm information can be synchronized in real-time; enable to use anywhere and anytime; detector your families; make it easier for your loved ones to get help; receive or eliminate the alarm; guarantee the security of the elderly in your home