The Garmin HRM 200 is Garmin's everyday chest strap heart rate monitor, and a straight upgrade in accuracy over any wrist-based reading. It suits riders training to heart rate zones who want reliable data without paying for running dynamics they will never use. The strap reads directly from the chest, which picks up changes far faster and more accurately than an optical wrist sensor, particularly during intervals. It transmits over ANT+ and Bluetooth, so it pairs with a Garmin or Wahoo head unit, a trainer app and your phone at the same time. The coin cell battery runs about a year, and the strap is washable. Key features Chest-strap accuracy for zone-based training ANT+ and Bluetooth transmission Around 1 year of battery life from a replaceable coin cell Washable, adjustable strap Available in M-XL sizing Wet the electrodes before you put it on: dry contacts are the cause of almost every erratic reading.