This device uses a physical method (most commonly a brief heat pulse or vibration) applied directly to the bite area. The heat‑pulse works by breaking down or neutralising the proteins / irritants that the insect injected when it bit you, thereby reducing the itch and swelling. Because there are no creams or chemical agents, it’s considered a chemical‑free, reusable alternative.

Yes—most of these pens are marketed as safe for kids (often “4 +” or with adult supervision) and for outdoor/travel or camping use. However, as with any device that uses heat or contact against skin, you should:

• Avoid applying it over open wounds, broken skin or rashes.
  
• Use caution for very young children or people with very sensitive skin and test on a small area first if unsure.
  
• Carry it in your bag or first‑aid kit when travelling or camping, since it’s compact and purpose‑built for on‑the‑go relief.

Usage:

• Select the device’s mode/temperature (if applicable) matching your skin type or severity of the bite. Some models have multiple temperature levels.
  
• Place the heated/chosen tip gently on the insect bite for the recommended duration (often just a few seconds).
  
• Remove, and you should feel reduction in itch and swelling shortly thereafter (many users report relief within 10–30 seconds).
  
  Maintenance & Expectations:
  
• Ensure the device is charged or has fresh batteries (depending on model). Some are rechargeable via USB‑C
  
• Store dry, and keep away from extreme heat or moisture to protect the heating elements.
  
• It's reusable (some models thousands of uses) but not a substitute for professional medical treatment if a bite appears infected or you have severe reactions.
  
• Because it uses heat pulses, you may feel a brief warm sensation when using—this is normal and part of the mechanism.

It’s typically suitable for bites and stings such as from mosquitoes, ants, bees/wasps, midges and other outdoor insect pests.

• Depending on model you may find:
• 
  Rechargeable lithium battery versions (USB‑C) that provide multiple treatments per charge
  
• Some require replaceable batteries.
  
  Always check what’s included, charging time, and how many uses per charge.