The difference between a fully automatic and a semi-automatic AED is very small.
The decision on which one to choose is often down to personal choice and circumstances. Both have their advantages and disadvantages and you need to choose the type of AED that you feel you would be most comfortable with or that which best suits your circumstances.
On the semi-automatic models you will find a shock button. Following analysis of the patients heart rhythm, a semi-automatic will tell you (if necessary) that the patient needs to be shocked and instruct you to push the shock button to administer the shock.
A fully automatic, on the other hand, will tell you to stand clear and automatically administer the shock itself, if analysis has detected that a shock is required. The advantage of the semi-automatic AED is that you can ensure that everyone is clear of the patient.
It also provides the paramedics with the opportunity to over-ride the defibrillator if they deem this necessary. A fully automatic AED can be more advantageous in environments where a user may be afraid to administer the shock themselves. Any delay reduces the survival chances of the patient. A fully automatic would be suitable for an environment where there are unlikely to be crowds of people around a patient, having to ensure that people are clear of a patient before a shock is administered would waste precious time.
See all AED's in our range here, here you can also filter on semi-automatic or full-automatic