Compatible with series of most Garmin products.
Portable USB is very convenient.

Specifications:
Color: Black
Transmission distance: Within 5m
Model: USB ANT stick
Size: 5.5 * 0.8 * 0.8cm / 2.17 * 0.31 * 0.31in
Weight: 8g / 0.27oz

Compatible with:
Forerunner 310XT
Forerunner 405
Forerunner 405CX
Forerunner 410
Forerunner 610
Forerunner 60
Forerunner 910XT
Forerunner 70
Garmin Swim
Vector
Vector 2
Vector S
vívofit
vívofit 2
vívofit 3

How to use:
Plug it into your computer's USB port. Automatically receives workout data when your fitness device is within range, and stores it in Garmin Connect (web-based) or Garmin Training Center (software).