The light weight Turbo Charge body is about the size a single AA battery. Using Turbo Charge is simple: Insert AA battery into one end, replace the end cap, insert the adapter cord into the other and then attach the entire assembly to your phone. One AA battery provides about 2 hours of talk time and 40 hours of standby time. Unit is shipped with charger, AA battery and adapter for your phone. Blue light confirms that your phone is charging. The blue light goes out when battery is out of power. The patented Turbo Charge technology detects the power needs of your phone and delivers just the power it needs, protecting your phone from overcharging.