---
product_id: 164518107
title: "Zero In Knockdown Plug-In Mosquito Killer Refill – Odour-Free, Kills Mosquitoes, Midges, & Biting Insects on Contact - Provides Up to 45 Nights of Protection - 30ml Refill Bottle"
brand: "zero in"
price: "£7.92"
currency: GBP
in_stock: true
reviews_count: 8
category: "Zero In"
url: https://www.desertcart.co.uk/products/164518107-zero-in-knockdown-plug-in-mosquito-killer-refill-odour-free
store_origin: GB
region: United Kingdom
---

# Up to 45 nights of continuous protection Odour-free, fragrance-sensitive friendly Kills mosquitoes & biting insects instantly Zero In Knockdown Plug-In Mosquito Killer Refill – Odour-Free, Kills Mosquitoes, Midges, & Biting Insects on Contact - Provides Up to 45 Nights of Protection - 30ml Refill Bottle

**Brand:** zero in
**Price:** £7.92
**Availability:** ✅ In Stock

## Summary

> 🦟 Defend your nights, live bite-free in style!

## Quick Answers

- **What is this?** Zero In Knockdown Plug-In Mosquito Killer Refill – Odour-Free, Kills Mosquitoes, Midges, & Biting Insects on Contact - Provides Up to 45 Nights of Protection - 30ml Refill Bottle by zero in
- **How much does it cost?** £7.92 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/164518107-zero-in-knockdown-plug-in-mosquito-killer-refill-odour-free)

## Best For

- zero in enthusiasts

## Why This Product

- Trusted zero in brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Odour-Free Comfort:** Enjoy a mosquito-free environment without any unpleasant smells disrupting your space
- • **Long-Lasting Defense:** Provides up to 45 nights of 8-hour continuous protection with a single 30ml refill
- • **Instant Knockdown Power:** Eliminates mosquitoes, midges & biting insects on contact for a pest-free zone
- • **Eco-Conscious Protection:** Ethical, welfare-friendly formula designed to protect your home and the planet
- • **Effortless Plug-In Refill:** Simple to replace and compatible with Zero In plug-in units for hassle-free use

## Overview

The Zero In Knockdown Plug-In Mosquito Killer Refill is a 30ml odour-free insecticide refill designed to work with Zero In plug-in units. It delivers instant knockdown of mosquitoes, midges, and biting insects across areas up to 12m², providing up to 45 nights of continuous 8-hour protection. Its fragrance-free formula ensures comfort for sensitive users, while its eco-conscious design minimizes environmental impact. Ideal for home or travel, it offers a powerful, easy-to-use solution for maintaining a pest-free living space.

## Description

Shop Zero In Knockdown Plug-In Mosquito Killer Refill – Odour-Free, Kills Mosquitoes, Midges, & Biting Insects on Contact - Provides Up to 45 Nights of Protection - 30ml Refill Bottle. Free delivery on eligible orders of £20 or more.

Review: Looking for revenge - you've got it - Why did you choose this product over others?: Stronger than others Effectiveness: Knock down potential This one is 30ml rather than 35ml, making it best for a two week use. it's also just over 1% proof as opposed to just under 1%, and can be smelled closer than a foot away. Beyond that, and it's undetectable, even to someone with COPD. Very effective, where other brands result in no mossys, this one results in corpses, still dying with their legs and wings falling off as you prod them, it 'aint pretty, but it works. Compatible with many "wick diffusers", these are good for the "tougher" jobs - (if this doesn't kill them, you'll need a hammer). Reverse terrorism in action, you can rest in peace, while they melt into in pieces. Always worth carrying as a spare "nuke" option, but the bottles are non re-sealable, and if you try they'll leak in aircraft on the way home. 9 times out of 10, this strength is completely unnecessary, but when you need it the the most, oh boy, it's like invisible Napalm ....
Review: Great product but only lasted a week - It seems to work. Last year I was plagued with mosquitos being close to the river. After getting a couple earlier in the Summer I thought I'd try this and so far I've not had one mosquito annoy me. It's silent and I cannot detect any smell. The only downside is the cartridge only lasted a week for me so there may be a cheaper alternative in the long run.

## Features

- Toxic to aquatic life with long lasting effects.
- Use biocides safely. Always read the label and product information before use.
- MOSQUITO KILLER REFILL- Designed to work effortlessly with the Zero In Mosquito Killer plug-in unit, this powerful refill targets and eliminates mosquitoes, midges and biting insects on contact, covering areas up to 12m². Ideal for continuous insect protection at home or while travelling
- ODOUR-FREE FORMULA- Keep your living space comfortable and pest-free with this mosquito killer plug-in refill. This insect killer replacement is formulated without any unpleasant smells, providing effective protection without disrupting your environment. Ideal for those sensitive to fragrances
- LONG-LASTING PROTECTION - Each 30ml refill bottle of mosquito repellent contains Prallethrin and provides up to 45 nights of 8-hour continuous protection. This long-lasting formula means fewer replacements, allowing you to enjoy consistent mosquito defence with minimal maintenance
- EASY TO REPLACE – Remove empty bottle and insert the refill into the existing plug-in unit (ZER740) and plug in for continuous overnight protection. The compact design of this mosquito killer plug-in unit is suitable for any room and makes it simple to maintain an insect-free space
- CARING FOR PEOPLE & THE PLANET – Zero In protects your health and home against Home Pest problems with minimal environmental impact. Zero In products are ethical and welfare-friendly solutions to everyday Home Pest problems that safeguard your well-being. We care for you, your family, and the planet

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07DQZXYQP |
| Best Sellers Rank | 2,490 in Garden ( See Top 100 in Garden ) 17 in Mosquito Control |
| Customer Reviews | 4.3 4.3 out of 5 stars (777) |
| Date First Available | 19 Dec. 2017 |
| Delivery information | We cannot deliver certain products outside mainland UK ( Details ). We will only be able to confirm if this product can be delivered to your chosen address when you enter your delivery address at checkout. |
| Item model number | ZER742 |
| Item volume | 30 Millilitres |
| Manufacturer | STV International |
| Part number | ZER742 |
| Power source type | No Power |
| Product Dimensions | 4.5 x 4.5 x 7.4 cm; 50 g |

## Product Details

- **Item form:** Liquid
- **Item weight:** 0.05 Kilograms
- **Liquid volume:** 30 Millilitres
- **Brand:** Zero In
- **Target species:** Insects

## Images

![Zero In Knockdown Plug-In Mosquito Killer Refill – Odour-Free, Kills Mosquitoes, Midges, & Biting Insects on Contact - Provides Up to 45 Nights of Protection - 30ml Refill Bottle - Image 1](https://m.media-amazon.com/images/I/71UCdEDvC9L.jpg)

## Available Options

This product comes in different **Style** options.

## Questions & Answers

**Q: I really want to use in my sealed garden nursery with 650 plants that I grow and sell. Will this kill or harm them, slow plant growth in any way? 🙏Xx**
A: Thank you for your query. This product is the refill for ZER740 Knockdown Mosquito Killer. This product will just deter/killing flying insects on contact. It will not harm the plants in your nursery. Please ensure no plants are directly positioned in front of the plug in unit however. Please do not hesitate to contact us with any further queries.

**Q: Can it be plugged into a uk shaver socket?**
A: Thank you for your query. If you have an adaptor plug to enable the 3 pin pug on the repeller, and have checked the voltage of the shaver socket compared to the product, this will be fine to use in a UK shaver socket. However, we wouldn't advise you do this as the product will not work very well in a damp room or a room with steam or high moisture. It is best used in a room such as living room, or bedroom, or caravan.  Please do not hesitate to contact us with any further queries.

**Q: Does this fit a boots repel diffuser?**
A: Thank you for your query. Unfortunately we cannot comment on other brands which aren't STV products, This is made for the ZER740 Knockdown mosquito killer. Thank you

**Q: Has anyone found these helpful against carpet/clothes moths**
A: Not sure if they work for those insects however we are currently vacuuming everyday to remove the multiple, a lot, mosquitoes it kills off

## Customer Reviews

### ⭐⭐⭐⭐⭐ Looking for revenge - you've got it
*by C***N on 19 June 2025*

Why did you choose this product over others?: Stronger than others Effectiveness: Knock down potential This one is 30ml rather than 35ml, making it best for a two week use. it's also just over 1% proof as opposed to just under 1%, and can be smelled closer than a foot away. Beyond that, and it's undetectable, even to someone with COPD. Very effective, where other brands result in no mossys, this one results in corpses, still dying with their legs and wings falling off as you prod them, it 'aint pretty, but it works. Compatible with many "wick diffusers", these are good for the "tougher" jobs - (if this doesn't kill them, you'll need a hammer). Reverse terrorism in action, you can rest in peace, while they melt into in pieces. Always worth carrying as a spare "nuke" option, but the bottles are non re-sealable, and if you try they'll leak in aircraft on the way home. 9 times out of 10, this strength is completely unnecessary, but when you need it the the most, oh boy, it's like invisible Napalm ....

### ⭐⭐⭐⭐ Great product but only lasted a week
*by B***R on 25 June 2025*

It seems to work. Last year I was plagued with mosquitos being close to the river. After getting a couple earlier in the Summer I thought I'd try this and so far I've not had one mosquito annoy me. It's silent and I cannot detect any smell. The only downside is the cartridge only lasted a week for me so there may be a cheaper alternative in the long run.

### ⭐⭐⭐⭐⭐ Work extremely well
*by J***S on 21 May 2024*

We have three of these, 2 in bedrooms and one in the main living space. Living in an area with lakes and water we get a lot of biting insects in the season. All three are plugged into smart plugs and set to come on 2 hours before bedtime and turn off 2 hours after. Kills all flying insects (including house flys, quickly). Worth noting there is no point in using any insect killer chemicals with doors and windows open as this doesn't let the concentration build up! No smell which is good. As the vaporizer can also be used with 'tablet' form insecticide it makes them very versatile. These are by far the best solution we have found (and we have tried al lot). Dont consider them expensive, they work extremely well and used the way we use them are good value for money. We dont get bitten at all now in the house at night.

## Frequently Bought Together

- Zero In Knockdown Plug-In Mosquito Killer Refill – 30 ml for Plug-In Insect Killer For Home & Travel Lasts for up to 45 Nights
- Zero In Knockdown Plug-In Mosquito Killer - Odour-Free Plug-In Insect Repellent Unit - Kills Mosquitoes, Midges, & Biting Insects on Contact - Provides Up to 45 Nights of Protection - 30ml Bottle
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*Product available on Desertcart United Kingdom*
*Store origin: GB*
*Last updated: 2026-05-30*