will this also charge cell phones ?

Yes, I charge both my IPAD and Iphone with it. The circutry in the charger, (like most) will supply the correct voltage.

What is actual total length of charger? the product page pdf lists dimensions as: Each information Depth 1.54" Width 4.625" I believe this may be package size otherwise this is HUGE beast

Item is about 3 inches long. Half of that goes into the plug. About 1 1/3 stick out. A little more than an inch in diameter for the section that had the plugs.

Will this work with the Nexus 7 tablet in my car?

Look at the amps required by the Nexus 7 and is it USB charged?

Will it work in a vehicle that has a 24 volt electrical system?

kensington site says 10-18vdc input; 5vdc 4.2A output..will not work on 24vdc system

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Kensington K39667AM PowerBolt Black PowerBolt 4.2 Fast Car Charger for Tablet

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Car Charger
USB
5V DC 4.2 Amps
Dual 2.1 AMP USB ports for fast simultaneous charging
Use the USB charging cable that came with your device
Automatically provides the maximum safe A

Overview

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Charge two tablets from one auto power outlet-and do it fast-with the Kensington PowerBolt™ 4.2 Fast Charge for 2 tablets. The PowerBolt 4.2 features PowerWhiz™ technology that recognizes the device you've plugged in and automatically delivers the fastest safe power level. The result is charge times that are the fastest available. It also means that Smartphones can also safely and quickly be charged.

Model
Brand	Kensington
Series	PowerBolt
Model	K39667AM
Type	Car Charger

Details
Color	Black
Adapter	USB
Standard USB Port	2
Output Amp	5V DC 4.2 Amps

Feature
Features	Dual 2.1 AMP USB ports for fast simultaneous charging Use the USB charging cable that came with your device Automatically provides the maximum safe Amp for faster charging Charges iPad, Samsung Galaxy Tab, Kindle Fire, Nook and many more Charges Smartphones, too

Additional Information
First Listed on Newegg	July 03, 2013

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Warranty, Returns, And Additional Information

Warranty

Limited Warranty period (parts): 2 years
Limited Warranty period (labor): 2 years
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Return Policies

Return for refund within: 45 days

Return for replacement within: 1 year

This item is covered by Newegg.com's 45/1 Return Policy.
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Kensington K39667AM PowerBolt Black PowerBolt 4.2 Fast Car Charger for Tablet

Learn more about the Kensington K39667AM

Customer Reviews of the Kensington K39667AM

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info

Item#: N82E16834989232

Kensington K39667AM PowerBolt Black PowerBolt 4.2 Fast Car Charger for Tablet

Learn more about the Kensington K39667AM

Customer Reviews of the Kensington K39667AM

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info