Bests & Worsts Reviews from Amazon

To calculate watts for DC: watts = voltage x amps To calculate watts for AC: watts= pf x voltage x amps Pf for resistive loads 1: this would be a simple motor Pf for inductive loads average .8 mostly electronic loads or inductive motors. So far so good. I got this, ran out to my truck, plugged it into the 12v outlet and hooked up my Coleman mattress air pump. Turned it on and away it went. It is not overly large at 6 inches long a little over 4 inches wide and 1.5 inches tall. Comes with battery clips that have a 22 inch cord and a 12v outlet plug that is 24 in long. It has 4 USB outlets which 3 are 2.4 amps and 1 is 1 amp. I will update after a few months of use. Update: 10/21/15 I have used this about 20 times now. At least 10 of those were out on the boat when I needed to air up and down the tow-able tube. This is such a nice setup. I got a cheap little bag to keep everything in. I have also used it for running a stereo off of my diesel truck batteries while out camping. Used it for a running a small air compressor and to run some lights to fix our 4 wheeler out in the dark while out camping and few other things. I am still highly impressed with this little power packed device. Updated 7/9/17 Still works great. I do keep it ina little bag. This thing always rides in my truck now unless it's boating season. Then it still gets used out on the boat.