Focusable 980nm 30mW Infrared IR Adjusted Dot Laser Diode Module 3V-5V with TTL 0-15KHz

Parameters: Diameter: 12mmWavelength: 980nmOutput Power: 30mWWorking Current: 100mAWorking Voltage: 3V-5VDCBest Duty Cycle: 1 minutes on, 1 minute offTTL frequency: 0-15KHzTTL modulation Voltage: 0-5V Off low, high open, normal status open Three-wire input, the red line is positive, black line is negative, TTL signal yellow line is positive, If you only connect its black wire and red wire, the laser would not work, you also need to connect its yellow wire (TTL+ ) to 5v+.980nm IR Infrared Laser can not be seen by the naked eye. Please use a Night Observation Device, for example, a phone with Infrared function. Thanks!