how hot does it get when under charging load of a dead phone or tablet?

I travel often and use it to simultaneously charge two iPhones or an iPhone and an iPad. It gets slightly warm, nothing to think about.

฿1,242^.26

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StarTech.com USB2PCARBKS Black Dual-Port USB Car Charger - 24W/4.8A

Charge two tablets simultaneously in your car
2 port USB Car Charger / Tablet Car Charger / Dual-Port USB Car Charger / USB Car Charger / Phone Charger for Car / Charge two tablets at once / High Power 24W 4.8A / Black
Ensure all your mobile devices are charged while you're commuting
Deliver the fastest possible power output required for each connected device
Charge almost any mobile device that supports USB Battery Charging Specification 1.2 support

Overview

Specs

Reviews (2)

Charge two tablets simultaneously, in your car - 2 port USB Car Charger - Tablet

Feature
Features	Ensure all your mobile devices are charged while you're commuting Deliver the fastest possible power output required for each connected device - up to a total of 24 watts (4.8 amps) shared between both ports Charge almost any mobile device that supports USB Battery Charging Specification 1.2

Additional Information
First Listed on Newegg	August 18, 2016

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Warranty Notice:
This product does not include manufacturer warranty when purchased or used outside of its designated sales region. By purchasing internationally, you acknowledge that warranty support from the manufacturer will not be available.