Glass comes with a USB cable and charger for charging Glass and connecting it to your desktop computer.
The connectors of the cable and charger are two-tone so you always know which way to plug in the USB. On Glass itself, the cable is at a right angle facing backward (the white half of the connector facing out) so that the base of the connector can be used to stabilize Glass on a flat surface while charging.
Plug the USB cable into your computer to charge Glass or transfer pictures. Otherwise, use the wall charger included with Glass to charge your Glass's battery.
Extra chargers are available for purchase in the Glass store.
If you don't see an accessory in the Glass store, don't panic. Check back again in a few days. Accessories appear automatically whenever they are in stock.