LONG RANGE WIRELESS DOOR/WINDOW ALARM SYSTEM (200 METERS) RELIABLE&DURABLE: 20+ years working in the electronics and wireless transmission field to ensure HTZSAFE has lots of experiences to make the products reliable and durable . 200 METERS LONG WIRELESS TRANSMISSION RANGE: The wireless range from the door/window sensor to the plug-in receiver is up to 200 meters (actual range will vary depending on the local terrain), the wireless range can go through the doors/walls/floors and etc. The system adopts advanced wireless transmission technology(FSK+FHSS) to avoid the wireless signal interference from other devices. WIDER APPLICATION RANGE: The gap between the sensor&39;s body and the magnet can be 8mm because of the powerful magnet, wider application for different windows and doors, it will reduce the false alarms if the windows or doors which will be shaking easily by wind. PLUG&PLAY,SUPER EASY TO INSTALL: The unit has been programmed before shipped, the installation time can be as little as a few minutes. FULLY EXPANDBLE SYSTEM- Expandable up to 32 sensors to 1 receiver, and 1 sensor can be added to unlimited receivers for complete coverage of your property. 4 volume levels adjustment and 35 optional melodies. Match different melody with different sensors around your property to differentiate which sensor is triggered(Such as the melody for the front door is &34;doorbell&34;, and for the back yard is &34; Backyard&34;.)PRODUCT SHTZSAFE Wireless Security Alarm System: Alerts you at anytime the door or window was opened.--Up to 200 meters long wireless transmission range(ideal conditions), it is a great solution even to monitor the large property.--Advanced wireless transmission technology(FSK+FSHH) to avoid the wireless signal interference from other wireless devices.--Plug-in receiver has 4 adjustable volume levels and 35 optional melodies, match different melody with different sensor around your property to differentiate where motion is being detected.--Fully expandable system, up to 32 HTZSAFE sensors can be added to the 1 receiver; and 1 sensor can be added to unlimited receivers. (Restart the receivers or sensors will not miss the records)--HTZSAFE focus on developing the Solar & Wireless Alarms more than 20 years, HTZSAFE has several kinds of transmitters and receivers which have different features for different applications and environments, and all the HTZSAFE products are compatible.