The RF3501LE Panic Transmitter has a fluorescent case that makes it easy to see in the dark. The large red single button makes it easy for users to send a panic or medical alarm to a monitoring central station or emergency service center. The light emitting diode (LED) above the button clearly shows that the transmitter is working correctly. The transmitter case has a clip, allowing users to attach the transmitter to a pocket. Users can also wear the transmitter as a pendant on the included necklace.