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.