Designed for NEJE master 2 mini machine, very light weight, stable high-speed engraving Better gray scale effect, the minimum focus point of all modules is only 0.02mm The best grayscle laser module. With adapter(laser pwm tester / laser switch board ) board, support 3d printer, cnc laser machine, other brand laser cnc machine, arduino project. ===== Interface ===== {{https://nejetool.oss-us-west-1.aliyuncs.com/wiki/NEJE_3_Max/A40640_interface.png?300x300}} 12V: Power positive . GND: Power ground or power negative. TTL/PWM: TTL = PWM, input 3.3V~12V to turn on laser module, conect to GND to turn off laser module. Temperature: do not connect, please ignore. Connect 12V and GND pin to 12V power, ensure the power adapter is sufficient, 5A is recommended. Connect TTL/PWM pin to your control board PWM output pin.