For $40, get a keychain gadget that acts as a charger, USB port, and much more

TL;DR: As of April 19, get the WonderCube Pro All-In-One Mobile Keyring for $39.99 (reg. $70) — a 42% discount.

Carrying a charger around for your phone isn’t always convenient, especially if you might not even need to use it. It’s the same thing with flashlights, flash drives, and other backup technology that’s essential when you need it and a chore when you don’t.

The WonderCube Pro puts iOS and Android chargers, flash memory, a flashlight, and more into a one-inch cube you can hang from your keys or backpack, all for $39.99 (reg. $70).

A keychain that’s also a phone charger

The WonderCube may look like any old keychain, but you can unfold it to reveal eight features that could really come in clutch. Low battery on your iPhone or Android? Unfold the USB and Micro USB connectors. Your purchase comes with an adapter for Lightning and USB-C devices that you can attach if you don’t have a Micro device. That’s also how you can charge USB-C computers or do a quick file transfer. And if your phone battery gets low, you can pop on a 9V battery and use your cube as an emergency charger. Just make sure your charger is standing still when you’re attaching the battery.

You may not even need to transfer files from one device to another if you have an Android phone. The OTG USB doubles as a flash drive, and you can even plug in a micro-SD card up to 128GB. Can’t find a good angle to stream or browse? Use the WonderCube’s micro-suction cup plate for a phone stand you can use almost anywhere.

This little cube is made to travel. The aluminum shell can take some punishment, and it even has a built-in flashlight in case you need a little help finding your way at night.