Fangrui Product Details Wireless And Convenient: The 433.92mhz Wireless Call Pager Is Easy To Carry Around And Can Be Used Without The Hassle Of Wires. Alert System: In Case Of An , The Pager Sends An Alert To The Nearest Hospital Or Center , Ensuring That You Receive The Help You Need. Long-range Communication: With A Range Of Up To 150meters, The Pager Can Communicate With The Center From Anywhere, Even If Youre Far Away. For Home Or Hospital Use, When A Patient Has An , He/she Presses The Sos Button, Which Sends A Signal To The Central Receiver. Suitable For Use In A Variety Of Places:the Product Is Suitable For Hotels, Home Care, Hospitals, Internet Cafes, Chess And Card Rooms, Restaurants, Confinement Clubs And Other Places Where Calls Are Needed Working Temperature: -10 C To 50c; Power: 12v/23a Battery (included) Tips: The Product May Be Updated Constantly ,due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does