SkyAngel~Wave has no monthly service fees of any kind. Once you buy the device you will never pay to use it. SkyAngel~Wave is similar to an ?OnStar" for Emergency Situations. This premier alert system provides freedom with security. With the touch of a button, you can talk with 911, anytime, from virtually anywhere. Other products like a traditional Personal Emergency Response System (PERS) only allow you to call for help within 150 to 600 feet away of a base station. Unlike a PERS, SkyAngel~Wave works both indoors and outdoors to ensure anyone has peace of mind knowing that help is always available. Due to 911 requirements and to assure exact location information, you must be able to speak your location and emergency information to the 911 operator. SkyAngel~Wave will use any available cell tower so you don't have to worry about coverage. With Automatic Fall Detection you are always covered wherever you are. No Contract - No Fees - No Bills - One Time Payment Free Automatic Fall Detection - Works anywhere there is a cellular signal from any carrier Waterproof - Wear it in the shower or in the bath tub Call and speak with 911 directly from the unit Self contained - there is nothing else to buy. No need for a cell phone, landline or WIFI