Small, yet efficient, the HMDX Jam Portable Speaker, Hx-p240gy delivers a lot of sound while taking up less desk space than a pencil holder. This speaker has an exclusive Jam2 feature that enables you to use it with another Jam Plus Speaker for a true stereo sound. The gray HMDX portable speaker can be used with any Bluetooth-enabled device, and the rechargeable battery lasts for four hours of wireless use. This speaker will work wirelessly up to a distance of 30 feet. With the line-in connection, you can also use this item with devices that don't have Bluetooth. HMDX Hx-p240gy Jam Plus Portable Speaker, Gray: Exclusive Jam2 feature pairs a 2nd Jam plus speaker for true stereo sound Works with Bluetooth-enabled devices up to 30' Rechargeable battery provides 4 hours of wireless play Line-in for connecting non-bluetooth devices Portable Bluetooth speaker color: Gray Safety Alert: Due to federal restrictions, this item cannot be returned by air mail.