Medline Tamper-Resistant Bed and Chair Patient Alarm.Medline Tamper-Resistant Bed and Chair Patient Alarm: Two buttons have to be pressed at the same time to turn off the alarm for preventing tampering and patient interference.Adjusts for different needs with a variety of tones, volumes and delay settings.Compatible with your nurse call system for simple implementation.Easily mounts to most wheelchairs using existing hardware.Must be used with alarm sensor pads, available separately.