Pressure-Sensing Safety Alarms: The MDT8400 series patient alarms come packed with some of the most sought-after technological features typically found only on more expensive alarms including Auto-Sensing without the need for an on/off switch. The best part is that you can choose from a number of optional accessories as needed. Tamper-resistant 2-button design limits patient/resident monitoring interference. Adjustable delayed alarm setting limits false alarms by patients with the flexibility to make brief movements away from their sensor mat. Volume control. Low battery indicator light. Extra-durable wheelchair attachment clip included pressure mats timed chair sensor mat, 1-Year Warranty. Sensor mat only. Alarm sold separately - MDT8400. 7" L x 15" W & approx 1/8" thick.