Main Function: Spy Video Camera/Life Recording Device Memory: No Internal Memory External Memory: TF/MicroSD Card (Max 2 GB) Power Source: Built-in Li-ion Battery (recharge directly from USB port) Battery Life: Up to 2.5 hours of continuous recording on one charge Video Recording Format: MJP Video Size: Over 15 hours of video on a 2 GB card Video Resolution: 640x480 Built in MIC Recommended Max Range for Objects: 2-3 Meters (Audio 1-2 Meters) Operating Systems: Windows XP / Vista / Windows7 Dimensions: 73mm x 20mm x 13mm (L x W x D)