1. This sound control light-operated USB table lamp will start the voice control mode automatically when sensing the darkness of the surroundings the sensing sound light will be auto on and will auto shut off after 120 seconds; 2. If you don't need sound control mode please press the switch button for 3 seconds or above the sound control function will be closed; If you want to restart it please quickly press it for twice; 3. Sound control mode will auto shut down if the induced peripheral environment is bright; 4. Can also be functioned as common table light just press the switch button to start or shut down; Widely used in bedroom sitting room bathroom hotel bar and office etc.