This Ryobi Score Secondary speaker only works when paired with the P760 Wireless primary speaker. (P760 is featured in the P765 2-piece set of speakers). This is a wireless speaker system that can connect up to 5 speakers instantly using SKAA technology. By connecting first with the primary speaker via Bluetooth, 4 other add on speakers can connect to the primary speaker instantly, using SKAA technology. These secondary speakers only work when the primary speaker is present. With up to 150 ft. of SKAA range, these speakers can be placed virtually anywhere in the home or on the job site and can still connect whether there is a wall separating them or not. Each speaker has their own independent volume control so you can set your preferences as needed. In each speaker, there is a high quality driver and passive radiator, so you will always receive clear, robust sound. Additionally, each speaker is equipped with a metal bar for convenient carrying, hanging, and storing of your device. Not only is this speaker compatible with any Ryobi ONE+ 18V battery, it also includes an AC power adaptor that allow you to use electric power as well. See below for more details.