Garmin currently have two power metering products. The Garmin Vector 2 and the Vector 2S. They are the same product the only difference being the Vector 2S is the cheaper option with just ONE pedal equipped with power metering, The Vector 2 package comes with BOTH pedals equipped with power meters providing true bi-lateral power measurement and accurate left versus right leg power balance.
Note > in late 2017 Garmin released the new Garmin Vector 3 and Vector 3s power meter pedals. More information to follow