4 PCS 4 AA Battery Holder USB Switch, 6V USB Female Socket, 4 x 1.5V AA Battery Case Box Holder On/Off Switch for RC Cars LED Light

These have been and still are doing everything I need them for!!!

These units (4 in this kit) convert 4 AA batteries (per unit) into one "USB charger" (that can be used to power/charge your USB powered devices). I don't expect to do this a lot (since I don't like to waste a lot of disposable batteries) but I consider it a nice backup option to have during long "power outages" (or anytime my USB devices are away from a power source).Yes, these devices do require you to have extra AA flashlight batteries to make them work. However, since I've been buying my AA batteries in bulk for years (to keep the cost per battery down), I almost always have a number of "spare" (not yet used) AA batteries around the house. So using those extra AA batteries as a "backup USB charger" seemed sensible to me. And I have already tested using this "charger" around the house, and it worked with my USB powered lights, my USB powered fans, as well as our cell phones (but the cell phones did show it as a "slow charge").NOTE: These "chargers" only work with USB devices that expect the older 5 volt USB power standard, not the higher voltage that some USB-C devices expect. So while these "chargers" will work with most of the USB powered devices I own, it does not work with our 2 laptops (which each require the higher USB-C voltage to power them). Of course, the laptops will continue to run (under their own power) until their rechargeable battery uses up it's stored power.

Exactly as advertised.

The cases have small clasps that all four of the units were broken on the side where the wire connects, making the door not seal completely. the usb connectors are misshappen or otherwise not able to be connected because the internal shelf piece common to usb a is either broken or out of tolerance so you can't plug in. 2 of the 4 had wires that were outside of the case holes and the wires were not connected inside the case. I simply threw them all away. It's not even worth the time to send them back. Trash Trash Trash Trash - Do not buy these.

The product works great, good price easily broken if dropped

Very happy with my purchase.

I ordered these to take on a cruise to power some salt string lights and some crystal string lights that we hung in our stateroom around our balcony door with magnetic hooks. I knew we probably wouldn't have access to USB plugs where we would want to hang the lights so this solved the problem perfectly! One set of batteries lasted all 8 nights of the cruise to power these lights all night long every night as soon as it got dark till the morning.

Works great with some fairy lights I bought that have a USB cord end for my wedding. Thanks so much