Lumo Body Tech, the company that makes the Lumoback posture sensor has raised $5 million in its first round of funding, with Madrona Venture Group leading the round. Also contributing were Yahoo co-founder and former CEO Jerry Yang and Innovation Endeavors, Google chairman Eric Schmidt's investment fund, which also contributed to Lumo's $1.1 million seed round April. With the $200,000 from their successful Kickstarter campaign that concluded in August, the company's total funding comes to $6.3 million.

The company plans to use the funds to expand their sales and marketing, product development, and engineering, the company said in a statement.

Lumoback is a sensor worn on the lower back which communicates via Bluetooth with an app on the user's Apple iPhone, iPod Touch, or iPad. It uses a stick-figure avatar to alert users when they're slouching and remind them to keep good posture throughout the day. The 8.5 mm-thick sensor also vibrates as an additional reminder for users.

The wearable sensors market in general has exploded in recent months, but most sensors have focused on fitness and activity tracking. Lumo's posture sensor is a unique entrant, although the company has said in interviews they may go on to make other kinds of sensors next.

Although Lumoback sensors are currently Apple-exclusive, the company said on its Kickstarter page that Android support is a high priority for development. The Lumoback is available for $149 on the company's website.