The Left Shoulder Harness Strap (162848-9) is for use with the Makita® ConnectX™ Portable Backpack Power Supply (PDC1200A01, sold separately), a portable power supply unit that extends the run time of Makita ConnectX Products, as well as compatible LXT and XGT Products (all sold separately). The shoulder strap assists with reducing the total weight of the tool in a user’s hand. The padded shoulder strap distributes the weight evenly for improved comfort. The strap is easily adjustable to improve balance. It quickly and easily attaches to the PDC1200A01.