T&J World TM Quality High-Resolution Waterproof Action Cam Audio Video DVR Camera Camcorder - LCD Display, SD Card Slot, USB Interface, A/V Port, Internal Microphone - Helmet Straps And Bike Mount Included, For Biking, Cycling, Racing, Skiing And Water Sports Waterproof.Built-in microphone Built-in microphone ;Uses AA batteries External Memory: SD card (4 GB max) - not included ;Reinforced rubber casing Records at 640 x 480 resolution .AVI video at 50 frames per second;Sensor: 1.3MP CMOS Great for all types of action sports such as two or four wheel vehicle racing, skiing, biking, rock climbing, paintballing and skydiving