---
product_id: 7229538
title: "6521 XO-1 Sensor Temperature and Voltage- Long"
brand: "traxxas"
price: "€ 24.91"
currency: EUR
in_stock: true
reviews_count: 13
category: "Traxxas"
url: https://www.desertcart.es/products/7229538-6521-xo-1-sensor-temperature-and-voltage-long
store_origin: ES
region: Spain
---

# Real-time voltage monitoring Easy flange mount installation Accurate temperature sensing ±1.5% 6521 XO-1 Sensor Temperature and Voltage- Long

**Brand:** traxxas
**Price:** € 24.91
**Availability:** ✅ In Stock

## Summary

> 🌟 Upgrade your Traxxas game with precision sensing power!

## Quick Answers

- **What is this?** 6521 XO-1 Sensor Temperature and Voltage- Long by traxxas
- **How much does it cost?** € 24.91 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.es](https://www.desertcart.es/products/7229538-6521-xo-1-sensor-temperature-and-voltage-long)

## Best For

- traxxas enthusiasts

## Why This Product

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

## Key Features

- • **Quick Replacement Fit:** Perfect OEM fit to keep your ride race-ready
- • **Durable Long Sensor Design:** Engineered for longevity and reliable performance 🔧
- • **Trusted by Pros & Enthusiasts:** Join thousands who rely on Traxxas for peak RTR performance
- • **Precision Voltage & Temp Tracking:** Stay ahead with real-time battery health insights ⚡🌡️
- • **Seamless Traxxas Link Integration:** Effortlessly sync data for ultimate vehicle control

## Overview

The Traxxas 6521 XO-1 Sensor Temperature and Voltage (Long) is a high-accuracy digital sensor designed for Traxxas RTR vehicles. It provides real-time battery voltage and temperature data with ±1.5% accuracy, mounts easily via flange, and integrates seamlessly with the Traxxas Link system. Built for durability and perfect OEM replacement, it ensures your vehicle stays in peak condition during every run.

## Description

Product Description Sensor, temperature and voltage (long) Use Traxxas stock and hop-up replacement parts to get the most out of your Traxxas RTR vehicles. This product is made from high quality materials and designed for long-lasting performance. This is replacement hardware for use on Traxxas vehicles; consult your user's manual for exact parts listings. From the Manufacturer Traxxas has grown to become the number-1 selling name in RTR nitro and electric models for the last 4 years running. No one has done more than Traxxas to advance the RTR category with innovative thinking and fun designs that make it easy for anyone to get started in the great R/C hobby. Traxxas, truly the fastest name in Radio Control.

Review: It's the real deal. - Works accurately and fit perfectly.
Review: Happy - Happy

## Features

- Functions with the Traxxas Link system to display battery voltage and temperature
- Long Temperature and Voltage Sensor with Mounting Screw
- Replacement for worn or damaged sensor

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B006IRXF6U |
| Best Sellers Rank | #95,082 in Toys & Games ( See Top 100 in Toys & Games ) #48 in Radio Control Vehicle Speed Controls |
| Brand | Traxxas |
| Customer Reviews | 4.6 4.6 out of 5 stars (546) |
| Date First Available | December 6, 2011 |
| Global Trade Identification Number | 00020334652102 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 0.01 ounces |
| Item dimensions L x W x H | 3.13 x 0.13 x 5.25 inches |
| Item model number | TRAM6521 |
| Manufacturer | HRPA - Traxxas |
| Manufacturer recommended age | 15 years and up |
| Material | As Pictured |
| Measurement Accuracy | ±1.5% |
| Mounting Type | Flange Mount |
| Output Type | Digital |
| Product Dimensions | 3.13 x 0.13 x 5.25 inches |
| Specific Uses For Product | Traxxas RTR vehicle maintenance and performance monitoring |
| Style | Modern |
| UPC | 783329517762 020334652102 885694932598 885932123412 696748268453 754295192581 |
| Upper Temperature Rating | 150 Degrees Celsius |

## Product Details

- **Brand:** Traxxas
- **Item Weight:** 0.01 Ounces
- **Item dimensions L x W x H:** 3.13 x 0.13 x 5.25 inches
- **Material:** As Pictured
- **Style:** Modern

## Images

![6521 XO-1 Sensor Temperature and Voltage- Long - Image 1](https://m.media-amazon.com/images/I/61Lyq548nmL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ It's the real deal.
*by J***S on May 17, 2025*

Works accurately and fit perfectly.

### ⭐⭐⭐⭐⭐ Happy
*by W***. on January 26, 2026*

Happy

### ⭐⭐⭐⭐⭐ Must have for Temp/Voltage telemetry for TRX4 crawlers
*by L***E on June 16, 2020*

I am using this in my TRX4 G-500 crawler. I think the temperature is very useful for heavy duty trailing or rock crawling, especially using 3s batteries. The voltage telemetry is an absolute necessity when you are using LiPo; especially when using the rig in such a way that the low-voltage feature of the Traxxas ESC may not be immediately obvious. The temperature probe installation is very easy - simply zip tie the flatter sensor part of the black hooped wire directly to the motor (any motor, Traxxas or otherwise). The readings are quick to transmit and seem accurate thus far. The wire length is just about perfect for the TRX4 chassis, with enough slack to route as desired, but not so much that you have to be creative zip tying the excess wire. The voltage installation will take some basic knowledge in electronics. Traxxas saw fit to fit the voltage wire with a JR male plug with a single wire to be attached to the positive power source. Using the Traxxas battery adapter is not possible without modification of the TRX4 ESC battery connector (which I am unwilling to do on a new rig). Many folks simply solder the red wire to the positive terminal of the ESC connector, and this is fine. However I prefer a plug/unplug option that doesn't require modification or soldering of the TRX4's connection. Because the xl-5 hv ESC comes with a full-voltage takeoff that runs straight to the battery (as confirmed by multimeter measurements using 3 different batteries), I decided to use that as my source for telemetry. However, the takeoff uses a JST male connector. So I simply built a JST female to JR female connector by soldering 2 red 20AWG wires attached to the respective terminals. I completely removed the black wire and the terminals originally attached to the stock connectors. I made the length long enough to feed under the battery tray, but not be too slack. Before attaching to the telemetry connector, I ensured perfect continuity from the red ESC battery connector to the final plug. Out of curiosity I plugged the telemetry unit and checked its continuity, and found that a 9.05Ohm resistor is wired into the unit. That same resistance was present without anything plugged into the telemetry cable... which explains how it works in the receiver box. The later model TRX4s (including the G-500) have BEC voltage going to the receiver. As a result, the telemetry picks up on this steady voltage and reports it to the transmitter *even when the voltage telemetry wire is not connected to the battery*. I would *not* trust this for good battery voltage reporting as it will mask the actual voltage coming from the battery. When I plugged the battery to the telemetry terminal, I could tell I was obtaining real-time voltage -- prior to connection, there was no momentary drop of voltage when I quickly throttled up the motor; post connection, the telemetry showed the momentary voltage dip one would expect from a quick throttle up. Getting the telemetry unit to fit in the receiver box was a bit tedious, but not hard really. I do wish there was perhaps 2-4mm of red wire to make it a little easier. So, save the money on the half-useless Traxxas adapter, buy some bulk connectors with cables and solder your own JR female - JST female adapter. $3 for the temperature mount is silly in my opinion since I connected mine with a zip tie for effectively less than 10 cents.

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.es/products/7229538-6521-xo-1-sensor-temperature-and-voltage-long](https://www.desertcart.es/products/7229538-6521-xo-1-sensor-temperature-and-voltage-long)

---

*Product available on Desertcart Spain*
*Store origin: ES*
*Last updated: 2026-02-26*