TAU power charger sustainable tech, goes anywhere

TAU® is the emergency powerbank for every device (Lightning, Micro USB, USB-C). Its keyring form factor is perfect to let you attach it to your keys when carrying it around. Yes, you can attach it to your keychain.

When you talk sustainable tech gadgets, you usually don't talk about power banks. But here's one that can help promote environmentally responsible practices and raise awareness about the importance of sustainable technology.

Thanks to Rolling Square, a team of young innovators believes that technology should enhance people's lives while keeping our planet's footprint in mind.

We define ourselves as "tech minimalists," and we strive to keep things simple and sustainable, especially when it comes to integrating tech gear into people's daily lives.

TAU® is the emergency powerbank for every device (Lightning, Micro USB, USB-C). Its keyring form factor is perfect to let you attach it to your keys when carrying it around. It's easy to use and gives your device a quick boost. It also helps solve the age-old problem of losing our keys.

TAU® is the best 3in1 power bank, fitting the Lightning, Micro USB, and USB-C ports. It’s the smallest power bank in the world, so you can attach it to your key chain, and comfortably use it in your daily life. It’s the best portable power bank and alternative to your regular, heavy battery charger. It will charge a dead iPhone about halfway when the TAU is fully charged.

TAU® features a USB-C and our patented Lightning + Micro USB cable, and is compatible with virtually every portable device in the world. Thanks to its proprietary dock, charging it is as easy and seamless as hanging your keys once you get home.