Suunto GPS Pod Wireless Transmitter Compact wireless transmitter for calculating speed and distance while training Employs GPS technology to help athletes fully analyze training routines Compatible with Suunto's T3, T4, and T6 heart rate monitors Transmission range of up to 15 feet; includes armband and attachment clip Runs for up to 10 hours on 2 AAA batteries; weighs 0.13 pounds; 2-year warranty