The Klein Tools AEPJS1 is a Powered Speaker that provides 5 watts of high-quality sound for smart phones, tablets, computers and other audio devices via a wireless Bluetooth connection or wired auxiliary input. It answers calls hands-free with the built-in speakerphone and can be magnetically attached to any steel surface. You can also attach it to Klein's Lighted Tool Bag (Cat. No. 55431), mount it to a standard 1/4-20 tripod, attach it to a lanyard, or simply stand it up on any solid level surface.