It could be the difference between life and death - and it can be accessed any time, for anyone in need.
Sainsbury's Local on Novar Drive has unveiled a new defibrillator fixed to the outside of its store.
The position means the life-saving device can be accessed 24/7 and not just when the supermarket is open.
Potentially, the machine could be used for anyone in the local area in an emergency.
Store manager Niall Moody said the company had borne the installation cost - and would maintain the equipment.
The kit has been purchased thanks to a project involving the charity St John Scotland and Glasgow city council.
Niall said: "It's for anyone to use - at any time.
"In the event of an emergency, people phone 999 and speak to an operator.
"If they require the defibrillator for someone they will be directed to this location and given the code.
"The machine gives out instructions through a speaker about what to do.
"It's very clever and could be the difference between life and death for somebody."
The machine is one of eight devices that have been installed in the West End and west of the city.
The money came from a local partnership that covers the city's Ward 13. The scheme is open to other areas.
Around 70 people each week in Scotland have a sudden cardiac arrest, but currently, only around one in 12 will survive.
For each minute that passes without any treatment, the person’s chances of survival drop by 10%.
By starting CPR as quickly as possible, and using a defibrillator where one is available, survival rates increase significantly.
'In the event of an emergency, people phone 999 and speak to an operator.
'If they require the defibrillator for someone they will be directed to this location and given the code.
'The machine gives out instructions through a speaker about what to do'
Margaret McAdam, Chair of St John Scotland’s Glasgow Area, said: “We know that to be most effective, a defibrillator needs to be used within the first few minutes of the person collapsing.
"We are keen that every community has access to one of these vital devices, and we realised that there are just not enough defibrillators across Glasgow."
She said: “We’ve been very pleased to secure funding from the local Area Partnerships to install eight new defibs around the west of Glasgow.
"We want to thank Sainsbury’s for their great support for the project and for hosting this defibrillator at their store, which will benefit the whole community and hopefully save lives.”
Niall said: “As a store we are really proud to support this initiative and it's another great opportunity to support the local community.
"The defibrillator is an amazing piece of equipment and really is very easy to use."
The other defibrillators are situated at:
* Knightswood fire station
* Three Craws pub
* Whiteinch Centre
* Broomhill Hyndland Parish Church
* Catani Anniesland Cross (hardware shop)
* Hyndland House student accommodation
* Cleveden High School