POLAR STRIDE SENSOR with Bluetooth connection, includes CR2430 battery. I used it indoors for Zwift running, but I'm selling it because I stopped running due to knee pain. I haven't used it outdoors, so I think it's in good condition. I confirmed the connection before listing it (#7). I will include one battery. - Brand: POLAR - Model Name: STRIDE SENSOR - Connectivity: Bluetooth - Battery Type: CR2430 - Included Items: Instruction manual Everything in the photos is included. Instant purchase is welcome. First come, first served. Please refrain from price negotiations. #Polar #StrideSensor Thank you for looking.