CORE 2 is an upgraded real-time thermal monitoring device 48% smaller and 30% lighter than its predecessor, CORE 1. It features a redesigned modular attachment system, including a detachable clip. The new CORE 2 body temperature sensor is more compact and promises enhanced features.
The updated design addresses clip breakage issues, making the device easier to secure and charge. Additionally, a new LED indicator provides clear information on device status, battery life, and charging progress, resolving previous challenges in determining when the CORE was ready.
Despite introducing a USB-C connector on the energy supply side, CORE 2 remains compatible with the CORE 1 magnetic charger. A software update will be released for both CORE 1 and CORE 2 users ahead of CORE 2’s launch in late March 2025.
CORE 2 retains the same price as CORE 1 while delivering significant design, usability, and functionality improvements.
The CORE CIQ App for Garmin has also continually improved; for example, it now includes heat strain index information in the FIT file for Garmin Connect.
CORE 2 Full specs
Final production specs may vary slightly.
Dimensions (without clip): 41.9 x 29.4 x 7.1 mm
Dimensions with clip: 45.1 x 32.6 x 9.6 mm
Device weight: 8.6 g (without clip) | 11.4 g (with clip)
Battery: Rechargeable lithium polymer cell (3.6V)
Power Supply: USB-C magnetic adapter cable (included)
Supply rating: 5V DC, max. 30mA current draw
Battery Life: at least 6 days; up to 30 days with standby mode enabled
Connectivity: Bluetooth low energy (BLE), ANT+ (2.4 GHz band)
Max transmit power: 8 dBm (6.3 mW)
Materials Description: Skin-compatible ABS (device) and TPU (elastic clip)
Immersion Resistance: >1.5m water column for >6 hours
The device is built with future-ready hardware for software updates teased by the manufacturer, packaged in 100% sustainable materials, and priced unchanged at 269.95 CHF, with local pricing to be determined closer to launch based on exchange rates and VAT.
4 thoughts on “new CORE 2 – body temperature sensor is smaller with more to come”
the core sensor is easily, hands down the worst training product i have ever purchased. $250 for a device that you cannot tell is working / paired, one that burns through battery when it’s sitting on the shelf to the point where every 3rd or 4th activity you’re greeted with a dead battery, a clip that almost never stays attached in the place you put it, on and on. and all of this for metrics to tell you you went from 100.1 degrees to 100.4 during training. wow, great
Thanks for the info. I was tempted to try one as I want to do some heat adaption from a warm-weather race I’m doing this year. Until recently, I didn’t know that Garmin’s heat adaption is effectively useless unless you ride outside, as it uses your GPS location to get weather data. I was hoping that Core would be more useful. Seems like it’s not worth it.
@Matthew, yes my understanding about Garmin’s heat adaptation is that it is effectively useless for the reason you say (I asked CORE who wouldn’t comment on that) and also because even if the weather forecast is correct it doesn’t tell you yoru temperature, it is YOUR temperature that I understand is what links to the adaptation.
i think core is only worth it if you can get hot in hot conditions. Personally I find it hard to motivate myself to do that which is a shame as there are material gains to be had in exchange for the suffering
@Indy, yes to a degree! Later firmware (updatable) via the app improve battery management.
I found the clip generally ok until recently when the black retaining pin seems to often come out. clearly CORE is aware of these two issues, both seemingly addressed in the new product (March)
if the metrics, when paired with a HRM, only show that change then you wont get heat adaptation
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the core sensor is easily, hands down the worst training product i have ever purchased. $250 for a device that you cannot tell is working / paired, one that burns through battery when it’s sitting on the shelf to the point where every 3rd or 4th activity you’re greeted with a dead battery, a clip that almost never stays attached in the place you put it, on and on. and all of this for metrics to tell you you went from 100.1 degrees to 100.4 during training. wow, great
Thanks for the info. I was tempted to try one as I want to do some heat adaption from a warm-weather race I’m doing this year. Until recently, I didn’t know that Garmin’s heat adaption is effectively useless unless you ride outside, as it uses your GPS location to get weather data. I was hoping that Core would be more useful. Seems like it’s not worth it.
@Matthew, yes my understanding about Garmin’s heat adaptation is that it is effectively useless for the reason you say (I asked CORE who wouldn’t comment on that) and also because even if the weather forecast is correct it doesn’t tell you yoru temperature, it is YOUR temperature that I understand is what links to the adaptation.
i think core is only worth it if you can get hot in hot conditions. Personally I find it hard to motivate myself to do that which is a shame as there are material gains to be had in exchange for the suffering
@Indy, yes to a degree! Later firmware (updatable) via the app improve battery management.
I found the clip generally ok until recently when the black retaining pin seems to often come out. clearly CORE is aware of these two issues, both seemingly addressed in the new product (March)
if the metrics, when paired with a HRM, only show that change then you wont get heat adaptation