Specification: Model: WA1820 USB output port: Max 5V， 2.1A Rated voltage: 18 (V) Shell material: ABS+PC Function description: This adapter can make 18-20V lithium batteries of Worx use on Worx 18V power tools, and let you enjoy the benefits of extended run-time of Li-Ion Batteries on your existing 18V tools. Maximum initial battery voltage(measured without a workload) is 20volts, Nominal voltage is 18volts. Applicable Worx 18/20V Li-ion battery model: WA3525,WA3578,WA3520,WA3575,WA3512,WA3512.1,WA3522,WA3544,WA3671 Converted to Worx 18V Nickel battery model: WA3127,WA3152 WARNING: Read the instruction manual 1. To reduce the risk of serious bodily injury, turn off the tool and remove the battery pack with adapter before making any adjustments or removing / installing any accessories. Any accidental start can cause injury. 2. Do not store or wear the adapter with the battery installed to allow metal objects to touch the exposed battery terminals and cause short-circuiting or fire. 3.Use the correct batteries for this adapter. An incorrect battery may damage the adapter. 4. Using an adapter that is unsuitable for machinery may cause malfunction or damage the power tool. Package Included: 1 x Battery Adapter with English manual (Power tools or batteries are not included)