Complete description:

Works with all of our 2.4GHz single and 4 camera systems. This DVR features compact size, on screen date/time stamp, and a 2.4Ghz receiver! Solid state DVR records audio and video using MPEG4 compression in AVI format Audio/Video input for connecting external devices Built-in 4 channel selectable 2.4Ghz receiver MP3 player and photo viewer Includes 64MB built-in memory (upgrade below) On screen date/time overlay Download recordings to your computer via USB 2.0 Rechargeable lithium polymer battery for 3 hours of usage Small size only 4.75 x 2.75 x 1" Comes with instructions, power supply, A/V cable, USB cable and stereo earphones. SECURE DIGITAL Memory Card available as an option below. Model and appearance may differ from pictured unit. Pictures are for illustrative purposes only. If ordering with a pre-hidden camera you will receive an identical unit in black color. All features will remain the same.