---
product_id: 573731506
title: "P3 International P4456 Kill A Watt Flex Electricity Usage Monitor – Advanced Power Meter with Data Memory, CO₂ Tracking & Cost Calculator – Upgrade from P4400 Watt Meter"
brand: "kill a watt"
price: "VT19540"
currency: VUV
in_stock: true
reviews_count: 8
category: "Kill A Watt"
url: https://www.desertcart.vu/products/573731506-p3-international-p4456-kill-a-watt-flex-electricity-usage-monitor
store_origin: VU
region: Vanuatu
---

# Measures volts, amps, watts Tracks CO₂ emissions & cost Stores power usage data P3 International P4456 Kill A Watt Flex Electricity Usage Monitor – Advanced Power Meter with Data Memory, CO₂ Tracking & Cost Calculator – Upgrade from P4400 Watt Meter

**Brand:** kill a watt
**Price:** VT19540
**Availability:** ✅ In Stock

## Summary

> ⚡ Power your savings, track your impact, and join the energy-smart elite!

## Quick Answers

- **What is this?** P3 International P4456 Kill A Watt Flex Electricity Usage Monitor – Advanced Power Meter with Data Memory, CO₂ Tracking & Cost Calculator – Upgrade from P4400 Watt Meter by kill a watt
- **How much does it cost?** VT19540 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/573731506-p3-international-p4456-kill-a-watt-flex-electricity-usage-monitor)

## Best For

- kill a watt enthusiasts

## Why This Product

- Trusted kill a watt brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Eco-Impact Insight:** See your electricity use alongside real-time CO₂ emissions for smarter, greener choices.
- • **Data Memory On-The-Go:** Never lose your power usage stats when switching outlets or devices.
- • **Dynamic Cost Calculator:** Instantly project daily, weekly, monthly, and yearly electricity expenses with precision.
- • **Multi-Metric Monitoring:** Track volts, amps, watts, and kilowatt-hours in one sleek, easy-to-read LCD display.
- • **Versatile Appliance Compatibility:** Perfect for fridges, heaters, gaming rigs, and any device with fluctuating power draw.

## Overview

The P3 International P4456 Kill A Watt Flex is an advanced electricity usage monitor that not only measures volts, amps, watts, and kilowatt-hours but also stores your data for seamless tracking across devices. It uniquely calculates your environmental footprint by estimating CO₂ emissions and projects electricity costs over various timeframes. Ideal for professionals seeking precise energy insights and cost savings on appliances with variable power consumption.

## Description

Buy P3 International P4456 Kill A Watt Flex Electricity Usage Monitor – Advanced Power Meter with Data Memory, CO₂ Tracking & Cost Calculator – Upgrade from P4400 Watt Meter: Power Meters - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: High Electricity Bill? This is what you need. - Tried to see what exactly made my electricity bill go up, and this was the product for it! Plugged it in, and almost instantly got results. After realizing it was a space heater, the product paid for itself when I decided to unplug it and save money on my bill. Great product, excellent accuracy, and great price!
Review: Besides Poor Manual, Really Helpful. - It took google and chat gpt to figure out how to input cost rates, but after that, really good. They need to improve the manual or make videos. This has been pointed out by many, and I concur, its bad. I really wanted to see how efficient an electric 1500 watt portable oil heater was, and after running it for a few days, at a 73 degree setting in a 10x10 office in November in CT, about 35 degrees outside, its about 21 bucks a month, much better i assume than my electric baseboard. The heater is on medium setting (750 watt?) with the dial about 1/3 open. I need my office warm, (or hot if you ask my wife), so the device works for me. This is not a review on my heater, but confirmation on its efficiency thanks to this device. If you wonder how much devices cost, this will help. Oil heat taks time to heat up, so I leave it on, so I guess I would need to factor in baseboard, on and off, but not sure. I give it five stars, as they can easily improve the manual, but it does what I wanted. I wish I could check my baseboard heater, but I cant. At least I can see what I'm using, could be a ballpark, but better than guessing.

## Features

- Unlike basic watt meters, the P4456 stores your power usage data, so you don’t lose readings when moving between outlets or appliances.
- See not just how much electricity you use, but your estimated environmental impact — a feature not available on standard watt meters.
- Instantly measure volts, amps, watts, kilowatt-hours, and projected electricity costs by day, week, month, or year with improved display cycling.
- Ideal for refrigerators, freezers, space heaters, AC units, gaming PCs, mining rigs, and appliances with fluctuating power draw.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0C4G7QVZT |
| Batteries Required? | No |
| Best Sellers Rank | #103,969 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #85 in Voltage Testers |
| Color | White |
| Customer Reviews | 4.1 4.1 out of 5 stars (71) |
| Date First Available | May 5, 2023 |
| Display Style | LCD |
| Included Components | Kill A Watt Flex Power Monitor P4456 |
| Item Package Quantity | 1 |
| Item Weight | 6.7 ounces |
| Item model number | P4456 |
| Manufacturer | P3 International |
| Part Number | P4456 |
| Power Source | ac_dc |
| Product Dimensions | 6.2 x 2.5 x 6.6 inches |
| Size | Pack Of 1 |

## Images

![P3 International P4456 Kill A Watt Flex Electricity Usage Monitor – Advanced Power Meter with Data Memory, CO₂ Tracking & Cost Calculator – Upgrade from P4400 Watt Meter - Image 1](https://m.media-amazon.com/images/I/71Q6AqxPC0L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ High Electricity Bill? This is what you need.
*by Y***U on August 27, 2025*

Tried to see what exactly made my electricity bill go up, and this was the product for it! Plugged it in, and almost instantly got results. After realizing it was a space heater, the product paid for itself when I decided to unplug it and save money on my bill. Great product, excellent accuracy, and great price!

### ⭐⭐⭐⭐⭐ Besides Poor Manual, Really Helpful.
*by J***N on November 28, 2024*

It took google and chat gpt to figure out how to input cost rates, but after that, really good. They need to improve the manual or make videos. This has been pointed out by many, and I concur, its bad. I really wanted to see how efficient an electric 1500 watt portable oil heater was, and after running it for a few days, at a 73 degree setting in a 10x10 office in November in CT, about 35 degrees outside, its about 21 bucks a month, much better i assume than my electric baseboard. The heater is on medium setting (750 watt?) with the dial about 1/3 open. I need my office warm, (or hot if you ask my wife), so the device works for me. This is not a review on my heater, but confirmation on its efficiency thanks to this device. If you wonder how much devices cost, this will help. Oil heat taks time to heat up, so I leave it on, so I guess I would need to factor in baseboard, on and off, but not sure. I give it five stars, as they can easily improve the manual, but it does what I wanted. I wish I could check my baseboard heater, but I cant. At least I can see what I'm using, could be a ballpark, but better than guessing.

### ⭐⭐⭐⭐⭐ Great Tool for Tracking Energy Use
*by V***E on May 19, 2025*

This is a great product at a great price! The P3 Kill A Watt makes it easy to track how much power each device uses, showing daily, weekly, and monthly costs. It’s been really helpful in figuring out which appliances are driving up my electric bill. The only downside is that it takes up the whole outlet when plugged in, but honestly, it’s worth it if you’re serious about cutting down your energy use and saving money. Highly recommend for anyone trying to get control of their electricity costs!

## Frequently Bought Together

- P3 International P4456 Kill A Watt Flex Plug-in Electricity Usage + Power Consumption Monitor, Watt Voltage Tester, Electrical Energy Saving Monitor with Auto Cost Calculator
- P3 International P4460 Kill A Watt EZ Electricity Usage Monitor , grey
- P3 P4400 Kill A Watt Electricity Usage Monitor

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*Product available on Desertcart Vanuatu*
*Store origin: VU*
*Last updated: 2026-02-08*