Don't buy jumper cables, instead buy one of the new "Booster Packs "(batteries). Looks almost like a briefcase. Bought mine at Pep-Boys for $ 90.00. Has a charger, so you can recharge it, when the indicators tell you to.
Easier for woman to use in an emergency.
You don't have to get your car into position to help another car.
Cable length are not a problem anymore.
Cigarette lighter plug gives you 12 Volt trouble shooting power, if you make yourself a test cable.
Use as emergency power for cell phones, during power outages in bad weather.
Try it, you will like it!
Hans Schmidt, Tulsa, OK (Tornado Alley)