How fast does it charge a phone?

It outputs 5 volts at 1 amp, so it charges at the older standard rate. Expect a phone to gain charge slowly; it is not a fast charger.

Does it come with a cable?

No. A USB charging cable or cord is not included, so you need your own cable for your device.

Any USB-powered device, as long as you supply the right cable. That covers phones, earbuds cases and similar low-power gadgets.

Yes. It has overload and short-circuit protection built in, which helps guard your device against surges in the car's electrical system.

It accepts 12 to 25 VDC, so it covers standard car outlets and 24V systems found in some trucks.

2 stores we checked sell it, including AmberPromos - Custom Printed Products, RELYmedia.

At RELYmedia, for $1.31, as of our latest check.

$1.31at RELYmediaChecked Nov 11

Compared across 2 stores. Prices are checked against each store and labelled with when.

It checks today's price at every store, compares the alternatives and answers in about a minute.