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.