A normal USB A to USB micro cable is needed. HLine ANT USB Adapter - Extended ANT + Stick with USB2 ANT2 stick also suitable for Garmin.
Garmin USB Ant+ Adapter for PC 4 Skroutz. With external ANT+ adapters you can connect to sensors and devices that use the ANT+ standard. Vívofit Owner's Manual 2 SM Sending Data to Your., Garmin.