The Garmin HRM-Tri is a lightweight and comfortable heart rate monitor designed for triathletes, capable of capturing heart rate data for running, cycling, and swimming (data is stored and transferred during swimming). It supports ANT+ communication and can record not only heart rate but also running dynamics data. I have confirmed that it works. I connected it to my Garmin vivomove active5 and it connected without any problems. I replaced the battery with a new one for this listing. I will also include a spare battery.