• One of the lightest pods and straps on the market, weighing 15 grams and 28 grams respectively. The patented electrodes increase reliability in all conditions, while the exceptional battery life lets you ride worry-free and reduces waste thanks to lower battery consumption.
• Adjustable and washable elastic strap
• Strap length: 28"-48" or 711-1219 mm
• Weight: 15 grams (pod) 28 grams (strap)
• Connection: 2 Bluetooth channels and ANT+
• RR intervals
• Waterproof up to 30 m (90 °F)
• Electrode material: rubber
• Strap connector: side
• Battery life: approximately 900+ hours
• Battery type: User-replaceable CR2032 3-volt (included)

Details that matter

The Hammerhead heart rate monitor uses a highly sensitive conductive rubber material capable of measuring heart rate in any condition. The material has excellent resistance to aging, temperature, and oxidation. The structure is flexible, allowing constant heart rate detection and longer durability. The electrodes feature a patented honeycomb pattern that increases skin contact area and improves breathability. Additionally, it enhances electrode contact with the skin and prevents the strap from moving up and down on the chest during intense exercise.

Master the route

One of the lightest pods and straps on the market, weighing 15 and 28 grams respectively. The patented electrodes increase reliability in all conditions, while the exceptional battery life lets you explore even greater distances and consume less power.

No sweat worries

Thanks to the waterproof design, you don't have to worry about the sensor being affected by sweat or water during your run. Absorbent and elastic materials ensure the strap stays on your chest even when sweating. After your run, simply remove the sensor housing to wash the strap and be ready for the next run. The Hammerhead heart rate monitor is water and sweat resistant.

Connect and go

Two Bluetooth and ANT+ channels allow pairing with two Bluetooth devices and any number of ANT+ receivers. Connect your Karoo via ANT+ for exceptional battery life on the road or use it with your running smartwatch and other indoor Bluetooth training setups.