Wireless and Convenient: The 433.92MHz wireless call emergency pager is easy to carry around and can be used without the hassle of wires. Emergency Alert System: In case of an emergency, the pager sends an alert to the nearest hospital or emergency 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 emergency center from anywhere, even if you're far away. For home or hospital use, when a patient has an emergency, 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, , 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 Not Affect Use Colour:Photo Color Material:ABS Package Contents: 1 x Wireless Button (Strap color is random, specified color is not accepted) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.