Anpress Wireless Alarm System for Home Safety,Operation Range 200 Feet,with Call/SOS Button in the Transmittter,Catains 1 Main Unit(Receiver),2 Calling Units(Transmittter), Batteries Powered ?Ideal Emergency Alarm?-- Simple to use two call button alarm/alert system for patient and caregiver - Ideal emergency alarm for elderly or disabled to call for help - Simply press either call button to alert the caregiver via the wireless receiver ?Multi-purpose?-- The transmitters has 2 kinds of buttons on it, CALL / SOS, simply press the CALL button to get a normal help or SOS to get urgent help, expecially for aged people, they can be worn as a pendant, carried in pocket, or placed at bedside. ?Battery Powered?-- Included 2 buttons with batteries installed - Requires 4 AA batteries for the receiver (not included) Operating Instructions Included, easy setup. ?Easy to Use?-- Operation range 200 feet,has 3 levels,High-Medium-Low, users can set it by themselves,easy to set. ?Applicable Scene?-- Stick the main unit by a screw in living room,kitchen,bedroom or any place where it could easily being heard, keep mom and dad safe secure with this Home Call Alert Pager System. Instantly know if mom or dad needs Help.