The BP-6AA is an external battery pack for any USB device. It mounts to the bottom of your handheld recorder using a tripod screw and powers the handheld recorder through the USB cable. Since the BP-6AA itself also has a tripod connector it can be mounted to a desktop stand. The BP-6AA battery pack increases DR-40s already-impressive 17.5 hour battery life to over 50 hours of recording. Compatible Models: Tascam DR-40 Tascam DR-05 Tascam DR-07MKII Tascam DR-100 Tascam DR-100MKII Tascam DR-2d Tascam DR-07 Tascam GT-R1 Tascam DR-08 Tascam DP-004 Tascam DP-008 Features/Specifications: External battery pack with six AA batteries ON / OFF switch USB output connector (power only) Powered by USB to adapter cable (included) or USB cable (included with recorder) Battery pod slides out of tripod attachment Mounts to the handheld equipment?s tripod connector