Key Specifications/Special Features: Helmet Camera, water-resistant handsfree action camera, sport camera, Supporting 4G SD card Outdoor Water-resistant Sports Camera, Helmet Camera, Digital Camera, Outdoor Camera, Water-resistant camera Sensor resolution 640 x 480 VGA CMOS sensor Built-in memory 32MB SD memory card drive supports cards of up to 4GB (not included) Movie storage: 640 x 480 pixels (30 x frames per second) 320 x 240 pixels (30 x frames per second) Status LCD 2-digit B/W Focusing range 3m to infinity Movie images AVI File format of Interface USB (1.1) Delete image All / last one Auto Shut-Off 30 minutes Battery 2 x 1.5V AA alkaline batteries (included) Dimensions 40mm diam. x 110mm length Operation system Win 2000/XP/Vista and Apple Mac X 10.4 and below