“5 inch screen, effective 800*480 HD, 3-48X zoom; HDMI 1080i60 output and AV out: connect to HD TV 2500mAh rechargeable and changeable battery 4 hours of work time Screen Lock: a text image on the screen is frozen for easier reading. Voice prompting feature Designed with two cameras: Press the upper right blue button after turning on the Power Key (Distance Key). Close view mode for reading is activated when the back light is turned on; distant view mode is activated when the back light is turned off. If the picture is static for more than two minutes, the magnifier will automatically shut down.”