Check the listing for details. 40/80W Blue Laser Head Driver Board Laser Driver With TTL For Laser Module. Condition: New. Listed at 14.09 USD. Support Voltage: 12V/24V Applicable Laser: 40/80W Size: 40*40mm Support PWM/TTL 1. Input voltage: Compatible with 12V and 24V DC input. 2. Adjustable current: external 5V PWM voltage signal, the signal duty cycle determines the output current, 0-3.5A corresponds to a duty cycle of 0-100%. 3. PWM signal description: Frequency range: 100HZ-30KHZ. 4. Over-temperature protection: Over-temperature regulation current, when the core temperature of the driver board reaches about 135 ℃, it will automatically reduce the output current. Prevent the circuit from being burnt due to excessive temperature. 5. Overcurrent protection: Abnormal overcurrent occurs, and the current in the circuit is quickly reduced to a safe level, thereby protecting the circuit and the load. 6. Dimensions: 40*40mm. Note: The voltage of the FAN interface is equal to the input voltage, so you need to pay attention when using this interface. Packing list：1PC