In a world of battery-hungry phones such as iPhones and Androids, the SpareOne Plus sticks out - its makers claim it lasts for 15 years.

The affordable mobile that runs on a single, AA battery and is built as a 'spare' phone for emergencies - it can even call emergency services without a SIM card.

Designed as a back-up phone you can carry without worrying if its charged or not, the SpareOne is built to leave in the car for emergencies, or to pack in travel luggage especially if you or your loved ones plan to go off the beaten track (or off-piste).

The simple numerical keypad is also ideal for older users who might only use a phone occasionally.

The new version, SpareOne Plus, has a GPS tracker which allows the user to be tracked by
emergency services - and can display its location on a paired iPhone app.

The SpareOne can be pre-programmed for instant access to phone numbers of key contacts, including the relevant emergency services in any location.

That single battery offers a talk time of up to 10 hours.

The phones developer, XPAL Power, says: its essentially designed to make and receive the most important calls, no matter what.

It even comes with the AA battery included.