Orange Fitness Heart Rate Monitor, OTF uses its own heart-rate
Designed to work as a ANT+, Bluetooth armband replacement is perfectly compatible with most popular heart rate monitor and sensor such as Orange
3Pcs Replacement Heart Rate Monitor Armband Straps Compatible with OTF, OTF Burn, Orange Theory Fitness, OT Beat Heart Rate Sensor
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OTF Orangetheory Heart Rate Monitor Workout Band - In Excellent Condition! Fitness And Activity Monitor for Sale in Los Angeles, CA - OfferUp
LIVLOV V11 Heart Rate Monitor Replacement Armband Strap - 20mm
Replacement Strap compatible with OrangeTheory Fitness OTF BEAT heart rate monitor.
Avocado Goods Replacement Armband Strap Compatible with Orange Theory Fitness OTBeat Heart Rate Monitor (1)