Bluetooth Outdoor Rock Speaker (canyon sandstone) - stereo pair by Sound Appeal Wireless rock speaker with long range Bluetooth technology 60w high efficiency class d amplifier Dimensions: 11.80" x 11.0" x 10.60" (per rock) comes in pair Can withstand extreme cold and heat without failure or reduced life Attractive canyon sandstone color. NOTE: These are stand alone speakers and they do not work with other speaker systems. They do not come with a volume control as they are controlled through Bluetooth. Hence use your phone's volume buttons / phone's volume buttons to adjust volume.