Audio Savings via eBay is offering a great price on these Rockville RPB25 40 Watt Portable/Outdoor Bluetooth Speakers for only $36 plus shipping is free. List price is $119 which represents a savings of 69% off. This speaker comes with FM, USB, SD, and Auxiliary Inputs. The battery lasts for 10 hours with the music playing at 70% volume. If the volume is lower, it will last even longer! This has a 3.7 Volt 2000 mAH battery.