Nitecore Heat It Classic USB-C Insect Bite Healer

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This pocket-sized device offers fast, chemical-free relief, perfect for tackling midges, mosquitoes, and more.

Heat It says: 

Heat it classic USB-C is a medical device for the relief of itching and pain caused by insect bites from mosquitoes, horseflies, bees and wasps. By applying heat, itchy bites can be quickly and easily relieved using your smartphone.This product works with iPhone 15 onwards as well as Android smartphones with a USB-C connector.

Our Verdict

Insect bites can ruin a trip faster than bad weather, but the Heat It Classic USB-C Insect Bite Healer offers a compact, chemical-free solution. This tiny device, weighing just 5g, plugs directly into a smartphone’s USB-C port and delivers targeted heat to relieve itching and pain in seconds.

Despite its size, the Heat It packs a punch. The app-controlled treatment allows 12 intensity levels, including a sensitive skin mode and a child-friendly setting, making it easy to tailor to different bite sensitivities. While the heat can feel intense—especially on the highest setting—it’s over quickly, with treatments lasting between 4 and 9 seconds. The keychain-friendly design makes it easy to keep on hand, and with no built-in battery, there’s no need for recharging or replacing parts.

This is a lightweight and sustainable alternative to creams and sprays for those prone to bites. It could be a real lifesaver in the Scottish Highlands at the height of midge season—turning a sleepless, scratchy night into a bearable one. Quick, portable, and surprisingly effective, it’s a great bit of kit to have ready on summer hikes.

– Reviewed by Ultralight Outdoor Gear

Features

• Smartphone App available on Google Play Store, App Store, Huawei Store and Aurora Store
• Medically proven principle: To relieve itching & pain, the affected skin area is briefly heated to around 51 °C. By using concentrated heat, you can treat insect bites reliably and easily. This chemical-free principle of local hyperthermia is medically confirmed.
• Always with you on the keychain: Small, handy and robust, heat it® is your ideal companion in everyday life, while traveling or during sports. The compact design means you always have it on your keychain and are prepared against itchy insect bites.
• For the whole family: With our app you can individualise the treatment to suit your sensitivity. Therefore, heat it® is also perfectly suitable for children from 3 years (self-application from 12 years). All in all, the free and intuitively designed heat it® app offers 12 different treatment options.
• Chemical-free & minimal battery consumption: heat it® only works with natural heat and completely without chemicals. By not using own batteries, you can benefit from a sustainable product with no follow-up costs. Up to 1,000 treatments at the highest level are possible with a fully charged smartphone battery. That’s enough for you, your family and friends.
• Fast application: Treat insect bites in moments with your smartphone. Simply plug heat it® into the charging port and the heat it® app opens. If necessary, you can now individualise the treatment. After a short warm up, place the contact surface of the heat it® on the insect bite. Depending on the setting in the app, the treatment lasts 4, 7 or 9 seconds.

Specifications

• Weight: 5g
• Dimensions: 37 x 17 x 9mm
• Maximum temperature: 53°C for 10 s max
• Compatible with –
  Android 5.0 or newer
  iPhone 15 or newer
  OTG-capable
  USB-C (Micro-USB smartphones via adapter)
• Not compatible with ZTE Axon 10 Pro, Axon 7, Blade A7 Vita’

Material & Construction

• Material Housing: PA-6-GF15 
• Material Protective Cap: PA-6-GF15
• Material Applied Part: Aluminium nitride