Posey Personal Alarm System - perhaps the most economical system for fall management and patient monitoring. This medical personal alarm is easy to use on beds, chairs, or even toilets. The alarm uses a proven magnet and pull-cord system: The cord can easily be attached to clothing and can be adjusted in length from 31-60 inches. Like other quality Posey alarms, the Personal Alarm has five selectable tones to help you distinguish between patients and other facility alarms. The personal safety alarm is loud enough to be heard easily (95 dB), yet easily quieted using a sound-dampening plug. The Personal Alarm from Posey is a great solution for patient and caregiver needs. A 9V battery is included with this personal alarm device.