Another consideration is how the sensor (through its cable, if applicable) is attached to its alarm or transmitter in the case of wired alarms or wireless alarms. Some wireless alarms are truly wireless, with the transmitter being part of the sensor and completely self-contained. For wired alarms, the sensor's wire (or cable) runs from the sensor (located at the point of urination) underneath the user's pajama shirt to wherever the alarm is located on the body (frequently on the collar of the pajama shirt, so that it is close to the ear).