Check the listing for details. Micro USB DC 2CH PWM Signal Generator Pulse Frequency LED Display Module. Condition: New. Listed at 8.98 USD. Package: 1X 2CH Adjustable PWM Signal Generator Features: 1. Two independent PWM generators can set the frequency, duty cycle 2. The wide frequency range, high accuracy 3. Can serial communication. Frequency is divided into three ranges: 1. XXX (no decimal point): the smallest unit is 1Hz, the range 1Hz ~ 999Hz 2. XX.X (decimal point in ten): The minimum unit is 0.1Khz the range of 0.1KHz ~ 99.9KHz 3. X.X.X. (there are three decimal point): the smallest unit is 1Khz the range 1KHz ~ 150KHz Frequency display example: "100" indicates that the PWM output pulse of 100Hz "54.1" indicates that the PWM output pulse of 54.1KHz "1.2.4." Indicates that the PWM pulse output 124KHz Duty Cycle in the range: 0 to 100 Three frequencies duty cycle is the same, all the parameters non-volatile. Specifications: 1. Working voltage: 5--30V, support micro USB 5.0V power supply 2. Frequency range: 1Hz ~ 150KHz 3. The frequency accuracy: ± 2% 4. Output Current: