Compatible for Battery: fit for battery, help you enjoy the ultimate stereo sound just need connect one pack your 18v battery. Enjoy music when working. Support for 48-11-1852, 48-11-1850, 48-11-1840, 48-11-1890, 48-11-1828, 48-11-1820, 48-11-1811, 48-11-1815, 48-11-1820, 48-11-1822, 48-11-1841, 48-59-181, 48-59-1850 18V Series batteries.(Battery not included in delivery) Support S Function: Pairing two speakers with one Blue tooth Device for Dual Sound Track Stereo Effect, create an immersive, high-fidelity stereo experience, give you a powerful sound environment. Perfect for , camping, party, outdoor, gaming, music and movie playback. Stronger Connectivity: This blue tooth speaker can be connected easily within 2 meters, and allowed 52ft distance connection. Also support USB audio source, only need plug-in the USB disk into this USB-A port of this , you will get music playing. Compact Size: Small size similar with one pack for 18V 6.0Ah battery pack, and less lighter than for one pack 18v battery. But could provide powerful sound, help you to enjoy music anytime anytime anywhere. Extra Output Function: Built with two output USB-A and Type-C port, connect with battery and turn on the speaker, can support recharge for your phone. Note: Only support Please note that the physical slightly color difference or difference, does not affect the use, please do not mind, thank you Colour:red Material:ABS+rubber Package Contents: 1 x Blue Tooth Speaker Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.