The Watch Link Pod utilizes the power and accuracy of the Apple Watch to broadcast your heart-rate metrics in real-time over ANT+. Highly portable and compact, the Watch Link Pod connects to any bike computer that supports connecting an ANT+ heart rate monitor. The Pod is powered by a CR 2032 3V coin battery providing power for up to a year of use. The CR 2032 3V coin battery can be purchased on Amazon or any general merchandise store.