I paid £19.99 for similar ones at Halfords just few months back.
Replaces the use of the troublesome booster cables to jump start your car
Connect the ends of the cable to the cigarette lighter sockets of both cars
LEDs indicate when the car is ready to be started
The time it takes depends on the status of the battery and can take anywhere from 5 minutes upwards. The cable can be stored wrapped around the unit to ensure a tidy storage solution within the bag supplied.
£2.99 for delivery. Or, pickup from store for free