Basic ingredients:
- Wristwatch: A touch screen or simple buttons that contain control options.
- Remote control: A handheld device with a prominent (red) button for calling.
- Antenna: To improve signal reception over a greater range.
Uses:
- Medical: To alert nurses or doctors when needed in hospitals or homes.
- My teacher: To summon children from school by parents
Communication range:
- The device usually works with wireless technology based on radio frequencies (RF) and the range reaches 300 meters.
Battery:
- The watch has a rechargeable battery and the remote has a replaceable battery.
Ease of use:
- A simple interface that allows anyone to easily request help with the push of a button.
Additional functions:
- Sound or vibration notifications.
- Custom icons on the screen to show connection status.
- Multiple options to customize alerts.