Plug the metal barrel end of the power cable into the back of the base, as shown in Figure 1, and plug the power block into a standard wall outlet (120-240 VAC, 50-60 Hz). Slide the handheld unit into the base and charge for at least 4 hours prior to the first use. 

A light on the base will indicate when the handheld unit is charging and the battery indicator on the display will indicate when the handheld unit is fully charged. 

Note: The handheld unit charges wirelessly while in the base and does not require a cord to be plugged into it directly. 

Keep the handheld unit in the base at all times when not in use, as shown in Figure 2, and keep the base plugged into a power outlet.