Square has released a new mobile card reader that is meant to improve accuracy and durability.

The new device looks like a thinner version of the company's original square-shaped device, with a custom magnetic readhead and spring. The new version parses redundant data from cards to improve swipes and is compatible with more mobile devices. The updated reader is also powered by the phone it's plugged into, eliminating the need for a built-in battery.

Square offers the new reader for free to anyone who signs up for a Square account. The device will also be available at more than 30,000 retail locations next year. A Square representative was not immediately available for comment.

By improving the mobile attachment, Square is placing a fresh focus on its original market of micro-merchants. The company has more devoted attention to attracting larger merchants with technology designed to be used in stores, such as the Square Stand hardware and Square Register app. Square has also pursued e-commerce via an online storefront it calls Square Market

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