1、The sound control is activated in the dark environment, and you can wrap the photoresistor in black for 24-hour sound control. 2、This sound control switch module also has light control function, and the photoresistor enables sound control a bight environment. 3、Allows for flexible application on small power appliances, such as solar lights, small alarms, small motor and so on. 4、Has sensitive sound sensing, the sound control switch module can be activated at sound of 20 decibels within 1 meter. 5、Including 5 pieces module, and the small size with light weight make the installation and carrying much more convenient. 5 x Sound Control Switch Module Item Type: Sound Control Switch ModuleProduct Material: Glass FiberModel: S330Input Voltage: DC 3V-30V (do not use dry batteries)Output Voltage: DC 3V-30V (how much voltage input is input, how much is the output voltage)Output Power: The output power of light (W) can not exceed the input voltage (V), and the current cannot exceed 1A. Activating Decibel: 20 Decibels (within 1 meter)Turn On/Off Delay Time: Fixed 45 seconds. (not adjustable)