The new 15 in. String trimmer is part of the new power head system. The rapid reload head makes it quick and easy to load new line. The 15 in. cutting swath, bump head line advancement and professional grade 0.095 in. cutting line makes completing yard work a breeze. Ego power head attachments are designed specifically for your Ego power+ power head. The advanced Ego power+ 56 Volt 5.0 Ah battery uses industry-leading arc-lithium technology to deliver power beyond belief and is compatible with all Ego power+ products.