New batteries, works great! Precise Performance: Provides accurate real-time heart rate data to enhance training efficiency and support optimal performance. Powered to Endure: Equipped with a high-capacity rechargeable battery with over 100 hours of active battery life, TICKR HEART RATE is always ready to train Completely Connected: With Bluetooth connectivity, it’s simple to connect TICKR HEART RATE to a smartphone, broadcast to a wide array of fitness equipment, and sync to the most popular training apps and accessories. Controlled Comfort: TICKR Heart Rate offers a slim, soft, secure fit strap, which feels comfortable, but also keeps the sensor securely in place during intense exercise.