Gas-like power you want, attachment capability you need. The RYOBI 40V Expand-it Power Head delivers power like a gas power head, with none of the hassle of mixing oil and gas. Attachment capability allows you to add RYOBI Expand-It attachments, saving you time, money, and space. The RYOBI 40V Expand-It Power Head comes with a 4.0 Ah High-Capacity Lithium-ion battery and charger for more power and runtime.