-LCD Display: the blue LCD clearly displays frequency and duty ratio, PWM output can set frequency and duty ratio independently. -PWM signal generator operating voltage range is DC 3.3-30V, adjustable pwm frequency range is 1Hz-150kHz, adjustable duty ratio range is 0%-100%. -High Frequency Resolution: frequency in range 1Hz~999Hz, display resolution is 1Hz; range 1.00kHz~9.99kHz, display resolution is 0.01kHz; range 10.0kHz~99.9kHz, display resolution is 0.1kHz; range 1kHz~150kHz, display resolution is 1kHz. -TTL Level Communication: the frequency meter is designed with single-chip TTL level communication, communication standard is 9600 bps. -Application: it can be used as a square wave signal generator, generate square wave signal for experimental development; generate square wave signal to control the motor driver; generate adjustable pulse for MCU; generate adjustable pulse to control the relevant circuit (PWM dimming speed application etc). Specification: Material: Plastic Size: 80x43x26mm/3.15x1.69x1.02inch Package Includes: 1 Piece Signal Generator(2 Pack) Note: Please allow slightly difference due to manual measurement. Color may be slightly different since different monitor.