Check the listing for details. ONE+ HP 18V Brushless Whisper Series 15 in. Cordless Attachment Capable String. Condition: Used. Listed at 103.99 USD. The RYOBI ONE+ HP Brushless 15" Attachment Capable String Trimmer is a true gas replacement, delivering more power than a 21cc gas string trimmer. Achieve over 40 minutes of runtime using an 18V 4Ah battery to tackle your entire yard (battery not included). RYOBI 18V ONE+ HP Technology delivers more power, runtime, durability and speed utilizing brushless motors, advanced electronics and HIGH PERFORMANCE lithium technology. Save money, time, & space with attachment capability & transform your string trimmer into a variety of tools - compatible with RYOBI EXPAND-IT attachments & other universal attachments. As part of the Whisper Series, it's 89% quieter than gas, so you can cut any time of day. Get to work quickly by reaching full throttle in under 1 second for instant power. An integrated.