"My tow truck guy used this to start a dead car that sat all winter...it worked so well I bought one myself!"
I recently needed a jump start and the tow truck driver that was sent out by AAA said his company put a JNC jump pack into each of their 8 service trucks. The microsecond he hooked this up to my truck, it lit up light a Christmas tree and started right away even though the car had sat
unused for over 6 months. I really like that THIS model (and the JNC770B) have an OFF switch, unlike the earlier models like the JNC660. The light on this unit is also ridiculously bright and the built-it digital voltage meter seems vastly superior to the analog one on the earlier models. I've already used the USB charger to recharge my cell phone on the road and I just couldn't be happier with the strength, quality and usability of the JNC770R.