1: With USB, when the mobile phone is temporarily out of power, you can charge the charging treasure function. 2.This adapter can make listed lithium batteries use for RYOBI 18V tools , and let you Enjoy the benefits of extended run-time of Li-Ion Batteries on your existing 18V tools. 3.Maximum initial battery voltage(measured without a workload) is 20volts,Nominal voltage is 18volts Notice: Allows for use of 20V MAX batteries and replacement batteries in most batteries of for Dewalt and for use of 18V Lithium-ion batteries and replacement batteries in most of batteries of for Milwaukee ,etc. Use for RYOBI 18V power tools. USB port for charging phones and powering equipment that uses usb, and USB Line is not included . Can not be used for power tool battery charging, this adapter will not fit intoany chargers. If you need to charge your power tool batteries ,please use the original battery chargers. Package Include 1x DM18RL (Only Adapter, No Battery)