This extremely compact video and audio digital interview recorder is smaller and lighter than a disposable cigarette lighter. The mini DVR has a one touch record button that records real time video using the 3GP video format with a resolution of 176x144. The video can be played back on select cell phones (cell phone must support 3GP video Format). The video can be view on you computer with a free software download from quicktime.com or real.com (currently Windows Media Player does not support the 3GP format). Just plug the included USB cable into the DVR and a open USB port to view the video. The unit is powered by a built in Lithium-ion battery that is charged when the unit is connected to a USB port with the included USB cable. You can place the camera up high or conceal it down low with color video with voice you can clearly see who's there and hear what they say. The tiny size of the recorder makes it ideal for a variety of uses. The DVR will record continuous until memory is full or the unit is manually turned off. The mini DVR has no internal memory and requires a Micro SD card -from 128MB up to 2 GB. We have included a 1 GB micro SD card. The unit weighs in at 0.634 ounces and measures in at 2.87 inches x 0.78 inches x .43 inches.