RYOBI's 40V Backpack Power Supply/Charger is going to be one of the most innovative power supply units on the market! Including three active battery ports that are compatible with all RYOBI 40V Batteries, this tool is perfect for any RYOBI 40V user. With the capability to connect to select RYOBI 40V handheld tools, like a string trimmer, blower, or chainsaw, this backpack gives you the maximum amount of runtime when you are tackling big jobs or are using these tools professionally and have multiple homes or businesses to maintain. This backpack is built with adjustable straps for added user comfort. The on-board LCD screen displays a fuel gauge for each battery in the backpack for easy and convenient updates on remaining battery charge. The Ryobi 40V Backpack Power Supply/Charger includes the Ryobi 40V Integrated Rapid Charger, which charges 4X faster compared to the RYOBI 40V Charger with USB Port (OP403A). Simply connect the charger to the backpack power supply with Ryobi 40V Batteries inserted, and it will charge each battery in sequential order. The charger's technology protects and improves battery life by monitoring battery charge current and temperature. When the job is done, easily store the charger adaptor in the mesh pocket for convenient storage. This power supply/charger works with select tools in the RYOBI 40V collection, refer to the info and guides section for more information. The 40V Backpack is backed by a 5-year tool warranty.