With up to 90min battery time, this will keep you busy for a long time. We would like to point out, that this pen has real 640x480 resolution, REAL 4GB Samsung Hi Speed Memory Chip - not modified or anything like that, and high resolution camera. Also, capable of taking photos and Videos! Quality controlled in the US and built to last with Samsung flash memory - the leader in flash memory! This isn't one of those cheap knock-off spy pens found from most suppliers. Use the Spy Pen to record real time video with audio evidence instantaneously! The ultra compact design makes it easy to use as a spy camera and as a normal pen. Record events, then simply plug the pen's built in USB connector into a USB port and watch your videos or look at your pictures.