The size of this Mini micro DVR Portable Pocket Video Recorder is 2 1/4" x 2" x 1/2"; it comes with its own Button/Screw Camera that is powered by the micro DVR. For wearable video recording devices where the need for concealment is paramount and one can understand why this is the first choice of professional private investigators. Micro DVR has Professional high resolution recording capability. The display on the unit is 1.5" and has the time/date stamp on the screen. View playback on the unit itself or through your computer by using the included USB cable. Uses a mini SD card (not included) This unit has a power save function, after 3 minutes of non use it will "sleep", tap the play button and the unit will resume.