Core 2 Thermal Sensor

CORE 2 monitors your real-time thermal data for better performance. Safely and effectively facilitate heat training to boost your haemoglobin mass and VO2 max or monitor your data on race-day so you can cool and pace your effort accordingly.

• 48% smaller and 30% lighter than the original CORE 1
• Delivers real-time core temperature data with high precision.
• Easy to wear on straps, bras, or directly on the skin.
• Helps improve VO2 max, hemoglobin mass, and lactate threshold.
• Used by Olympic champions, ultrarunners, and elite coaches

What is CORE?

Technical Specifications

• Compact Size: 41.9 x 29.4 x 7.1mm (no clip) | 45.1 x 32.6 x 9.6mm (with clip)
• Weight: 8.6g (no clip)  |  11.4g (with clip)
• Battery: 6 days; up to 30 days with standby mode enabled
• Power Supply: USB-C magnetic adapter cable (included)  
• Connectivity: Bluetooth low energy (BLE), ANT+ (2.4 GHz band)
• Waterproof: up to 1.5m (IPX7 rating)
• Research-backed accuracy: mean difference range of -0.01°C to +0.23°C

In addition:

• Waterproof up to 1.5m (IPX7)
• Bluetooth BLE & ANT+ Connectivity
• Connects with: CORE iOS and Android App, WatchOS, Wear OS, Garmin ConnectIQ watches and bike computers, Wahoo bike computers, COROS watches, SUUNTO watches and more...

What’s In The Box?

• CORE 2 Thermal Sensor
• CORE 2 HRM Strap Clip
• Magnetic USB-C Charging Cable
• Product Information Guide
• Fully Recyclable Packaging

Wearing the CORE sensor

The CORE sensor is typically worn on the side of the chest in a consistent position.

For sports, the CORE sensor should be paired to a heart rate monitor for the best results during sports activities. It can be fastened to the heart rate monitor strap (or a sports bra) and secured with the provided clips. For runners, the medical grade sports adhesive patches can be used to stick the CORE securely to the skin. 

For everyday activity, the medical-grade adhesive patches can be used. The disposable 'sticky patches' can be re-ordered as needed.

Data and Connectivity

The CORE sensor has an accompanying Smart Phone App for iOS and Android. With data synchronization, the real-time and historical core body temperature data and performance metrics can be viewed and saved to the CORE cloud web app (no additional fee). 

Popular Smart Watches including Garmin Connect-IQ, AppleWatch, some wearOS watches, COROS and Suunto watches have apps and integration for the CORE sensor. CORE connects to Garmin Connect-IQ, Wahoo and Hammerhead Karoo bike computers. Many sports devices save the core body temperature data into the FIT file. 

The core body temperature sensor is compatible with popular third-party sports training software and the integration with devices and software continues to grow. This is a list of CORE sensor compatibility and setup guides.