If you have suddenly become unwell at home, or have had a fall or accident and can't get up, it's reassuring to know that, by simply pressing a button on a pendant round your neck or wrist, help will quickly arrive. Many people may already be familiar with these types of 'lifeline alarms'.
Depending on your circumstances there are also other gadgets available which can be used to help keep you safe or to summon assistance in an emergency.