Table lamps to be charged expediently by USB cable ，only takes 2 hours to be fully chargedBuilt in 500Mah rechargeble batteries in this table lampsBlow the air into the table lamps will turn on it， blow it agian will turn off it or use your hand to pat the light will turn on itInsert the USB joint into the computer to charge the table lamps or connected by adapter to insert into the socket to charge. Put the switch to the "ON?"， then the functions of the table lamps be started. If don?'t use the table lamp in long term please put the button to the "OFF?". Please charging the table lamp at least 4 hours when you first use it，and after it will be fully charged at two hours. Rotary switch for easy adjusting the brightness: clockwise rotation to enhance the brightness，contrarotate to weaken the brightness.This table lamps has anti-skidding base can avoid the led light to be overseted when it on slant placeThe power of the table lamps is 0.4W and generates smooth ray of light，very enviromental and has long lifetime