The Makita® Harness Assembly (1913P9-4) is for use with the ConnectX Portable Power Supply (PDC1200, sold separately) and the Makita® 40V max ConnectX™ 1,500Wh Portable Power Supply (PDC1500, sold separately). The Harness Assembly features padded shoulder straps to distribute weight evenly for improved comfort. The 1913P9-4 features an easily adjustable belt and straps for improved balance. There is a quick release clip for quick installation and removal.