Spire’s Health Tags, the dark and tiny devices you stick on your clothes to gather all sorts of health data from your steps, heartbeat and stress levels is now available at your local Apple Store.

The company started out with a breath tracking device to detect when you are feeling tense and help calm you down. But four years in and its now all about the wearable “tags” you stick on items of clothing like your pants or sports bra.

Yes, yes, there are lots of gadgets out there to gather similar information — the Apple Watch will now even detect if you have a fall or if something is wrong with your heart — but the Spire health tag is nothing like a Fitbit or Apple Watch, according to the company. For one, there’s zero need to charge the device. One tag’s battery will last a year and a half before dying out. They’re also machine washable. You just pick a few outfits and stick a tag on each of them.

Of course a few other startups out there are working on making smart, washable, data-gathering clothes. Enflux makes the clothing and then sews in the motion sensor to tell you if you are lifting correctly. Vitali is a “smart” bra with a built-in sensor to detect stress. Then there’s OmSignal, which makes body-hugging workout clothes that gather “medical-grade biometric data to achieve optimal health.” But these tiny health tags are different in that they allow you to choose the clothes you want to adhere the monitor to.

Like Spire’s first product, the Stone, which earned more than $8 million in sales, according to the company, the tags will also pick up on times of stress and help calm you down through a series of breaths and focus on the app.

“Continuous health data will revolutionize health and wellness globally, but early incarnations have been hampered by poor user experiences and a focus on the hardware over the outcomes that the hardware can create,” Spire’s founder Jonathan Palley said. “By making the device ‘disappear’, we believe Health Tag is the first product to unlock the potential.”

Spire’s Health Tags will be sold in Apple Stores as a three-pack for $130, six-pack for $230 and an eight-pack for $300, with additional pack sizes available on the company’s website.