Garmin Indoor Foot Pod Accessory for Forerunner 305 Now you can take your Forerunner 305 indoors Unit attaches to your shoelaces and accurately measures speed and distance Runs on one replaceable AAA battery; offers 70 hours of run time Measures 2.9 x 1.6 x 0.98 inches (WxHxD); weighs 1.41 ounces Note that compatibility with the Forerunner 305 requires an update to software version 2.5