Handcross Defibrillator

What is a Defibrillator

Defibrillation is a treatment for life-threatening cardiac dysrhythmias, specifically ventricular fibrillation (VF) and non-perfusing ventricular tachycardia (VT). A defibrillator delivers a dose of electric current (often called a countershock) to the heart. 

Please see the attached link  

 http://www.sja.org.uk/sja/first-aid-advice/first-aid-techniques/using-a--defibrillator-aed.aspx