2.2 inch LCD screen Approval certificate:CE,FCC,RoHS. Wider view angle:100 degree lens. Using the digital camera chip, 300000 pixels, much clearer image. Low power consumption: 2xAA batteries support 1700 peeps and no standby power loss. Convenient installation, no lines. 15S automatic shutdown, users need not worry about battery runs out quickly if forgetting shutdown. Easy operation: just press the button (image displayed immediately, video automatic switched off in 15 seconds),so convenient for children and the elderly. No shadow can be seen from outside, so as to protect privacy of the house owners. Quick start:just push the button, without waiting, image displayed immediately.