| 1) please open the battery cover and install the battery in correct direction, then close the battery compartment. 2)opening the power switch,there are picture display on the lcd screen.you can adjust led fill light when it is in dim light condition,meanwhile,please close the led when it is clear enough. 3)you can adjust the brightness of the lcd screen when the picture display is very dim, so that you can get the best display effect. 4) please stretch the flexible hose to the places which you need to observe 5) please switch off the power after finishing using it to reduce the loss of the battery electricity.meanwhile,please take out the battery when you do not use it for a long time. 6) recommend you use high performance battery |