Technical Size Measurements: Height: 100mm Width: 65mm Depth: 30mm • VERSATILE MOUNTING SYSTEM. Allows alarm to be fixed to a surface or to be used free-standing. • 7 YEAR SENSOR. This model has a top quality Figaro electro-chemical sensor ensuring accuracy and longevity. • AUTOMATIC SENSOR TEST BUTTON. • CO ALARM SILENCE. This silences the alarm for up to 10 minutes. • END OF LIFE INDICATOR. This sounds 3 short beeps every minute indicating the end of sensor life. • LOW BATTERY WARNING. Soft intermittent sound for up to 10 hours. Ideal for night-time use. • LED INDICATORS. For power, alarm and fault condition. • LONG LIFE LITHIUM BATTERY. Sealed into unit.