The Magene heart rate monitor is Bluetooth compatible and accurately measures your heart rate during exercise. I've used it for about six months, and the band has been thoroughly washed and is clean. The battery compartment has some scratches because I used a flathead screwdriver instead of a coin to open it. Please refer to the photos for details. If the information from the person I purchased it from is correct, it's a Magene H64 heart rate sensor chest band. - Brand: Magene - Included items: Belt, sensor, battery - Bluetooth function: Compatible - Battery type: Button battery Thank you for looking.