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Hammerhead Heart Rate Monitor

Hit your training goals and get more out of your Karoo with real-time heart rate data. A washable chest-strap designed for fit and comfort, including conductive rubber electrodes, allows for great connectivity and durability.

$64 USD

Taxes will be assessed at import. Learn more.


301 Reviews

4.7/5 | Based on 301 reviews

  • Adjustable, washable, elastic strap
  • Strap length: 28”-48” or 711-1219mm
  • Weight: 15 grams (pod) 28 grams (strap)
  • Connection: 2x Bluetooth channels and ANT+
  • R-R Intervals
  • 30m (90f) Water-proof
  • Electrode material: Rubber
  • Strap connector: Side
  • Battery life: Approx. 900+ hours
  • Battery type: User-replaceable CR2032 3 volts (included)

  • May ship separately from other items in your cart.
  • Used products are non-refundable. We gladly accept returns of unworn, unwashed, unused products.
  • Please double-check your shipping address as we may not be able to change a wrong address before the order is dispatched.
  • Tracking information is sent in 3 to 5 business days.
The Details that Matter

The Hammerhead Heart Rate Monitor uses a conductive rubber material that is highly sensitive and capable of detecting heart rate in all conditions. The material has excellent resistance to aging, temperature and oxidation. The construction is flexible and allows consistent heart rate detection and durability. The electrodes feature a patented honeycomb pattern that increases the skin contact surface area and improves moisture drainage. It also improves electrode contact with the skin, preventing the strap moving up and down on the chest during intense exercise.

All-fabric electrodes with woven silver on the Hammerhead Heart Rate Monitor
Connect and Go

Dual Bluetooth channels and ANT+ allow you to pair to two bluetooth devices and any number of ANT+ receivers. Pair your Karoo over ANT+ for exceptional battery life out on the road or use it with your smartwatch for running and other bluetooth indoor trainer setups.

Woman clasping the Hammerhead Heart Rate Monitor on her chest before a ride
Don’t Sweat It

A water-proof design means you don’t have to worry about sweat or water interfering with your sensor while riding. Absorbent and elastic materials allow the strap to stay in place on your chest when the sweat starts pouring. When you're done riding, easily remove the sensor casing to wash the strap and be ready for your next ride.

The Hammerhead Heart Rate Monitor is water and sweat resistant
Ride the Distance

One of the lightest pods and straps on the market at 15 grams and 28 grams respectively. The patented electrodes increase reliability in all conditions while the exceptional battery life keeps you riding and reduces waste with less batteries.

The Hammerhead Heart Rate Monitor is water and sweat resistant
    The Hammerhead Heart Rate Monitor pairs with Karoo via ANT+ or Bluetooth

    Get More Out Of Your Karoo

    The Hammerhead Heart Rate Monitor seamlessly pairs with your Karoo, transmitting real-time heart rate data through beautiful, graphical visualizations.

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