Batteries: 1 Lithium ion batteries required. Product Dimensions: 11.02 x 8.66 x 5.12 inches Item Weight: 6.4 ounces About this item ·  Hidden Camera Hat: it looks like an ordinary fashionable hat, but it built-in 720P HD real-time video recorder with vibration commend for each operation ·         supports up to 16GB  to 64 micro SD card(not included) ·         Best 720P Video Resolution: This hat camera record 1280x720p HD video with frame rate 30fps - so recorded events are always crystal-clear

Long Rechargeable Battery Life: It built-in high-capacity rechargeable lithium-ion battery which can make a video up to 30-60 minutes per charge