1. Brand new and high quality. 2. Suitable for serial communication. 3. Wide frequency range, high accuracy. 4. Two independent PWM generators can set the frequency and duty cycle. Module Parameters: 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: 30mA. 5. Output amplitude: Default 5Vp-p (settable). 6. Operating temperature range: -30 ~ + 70 . 7. Product size: 4.3x2.9x0.9cm - 1.69x1.14x0.35in