• Real-life experiment shows bug spray can kill Fitbit Airs
• It's to do with the chemicals inside the repellent
• Spray carefully, as you won't be covered under warranty

Here at TechRadar we've been rather impressed by what the Fitbit Air has to offer, but one unfortunate user has found out the hard way that you shouldn't use bug spray when the fitness tracker is wrapped around your wrist.

The problematic incident was recorded on Reddit (via Phandroid), and it seems that a thorough and protective application of bug spray has eaten into the plastic component of the Fitbit Air, stopping it from functioning.

"Went on a hike this weekend with my Fitbit Air," reads the original Reddit post. "I've had it for 14 days now, and I found out that bug spray will destroy it. I had put some on the cuffs of my hiking shirt and it transferred over to the device and broke down the plastic."

To make matters worse, the user reports that the same fate befell his wife's Fitbit too (though it's not clear if that's also a Fitbit Air). The original post ends with a recommendation to "save your cash for something built better".

Little sympathy

Fitbit air and bug spray don't mix from r/fitbit

The Reddit detectives went straight to work, determining that it was likely the chemical DEET (N,N-diethyl-meta-toluamide) causing the problem. It's widely used in insect repellents, and is pretty harsh on plastics as well as bugs.

And sympathy seems to be in short supply on the Reddit thread. "The documentation very clearly states that it shouldn't come in contact with sunscreens and bug sprays," writes one poster, while another says: "This is on you buddy."

Google isn't being particularly sympathetic either, telling the affected user that the damage counts as environmental or accidental damage, and so isn't covered under the warranty. No replacement Fitbit Air will be forthcoming in this case.

There have been other stories like this in recent days, so it seems a substantial number of people aren't aware about the damage that insect repellent can do. As ever, always read the small print — on both your fitness trackers and your bug sprays.

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Dave is a freelance tech journalist who has been writing about gadgets, apps and the web for more than two decades. Based out of Stockport, England, on TechRadar you'll find him covering news, features and reviews, particularly for phones, tablets and wearables. Working to ensure our breaking news coverage is the best in the business over weekends, David also has bylines at Gizmodo, T3, PopSci and a few other places besides, as well as being many years editing the likes of PC Explorer and The Hardware Handbook.