G1 GPS sensor

Measures speed and distance for running and cross training. Calculates speed within 0 - 18.3 mph. Operates on 5kHk transmission and uses SiRF Star III technology for accurate GPS readings. Includes one user-changeable AA battery. Durable, reliable and lightweight - weighs only 80g. Water resistant to 30 meters. Adjustable armband is machine washable.