1: Output terminal of the output square wave signal, the amplitude is approximately equal to input voltage. 2: Output duty cycle is not adjustable, basic stability of duty cycle of the output signal in the process of adjusting the frequency (50%-65%). 3: Frequency through built-in multi-turn potentiometer adjustment, specification:adjustment range: H Verson is 50Hz-6kHz/adjustment range:L version is 0.8Hz-60Hz; 4: 3P 2.54mm Pin header Power:Supply Voltage DC 5V-15V , No-load current is about 3mA. Output drive current:The output circuit is capable of sinking or sourcing current up to 200 mA. Operation is specified for supplies of 5 V to 15 V. With a 5-V supply, output levels are compatible with TTL inputs. Uses: Used as signal source in the circuit; Method of use: 1. Input power then work ; 2. Terminated with a power supply filter capacitor 0.1uf to be more stable. 3. Clockwise adjustment potentiometer, frequency increases, adjustment potentiometer counterclockwise, frequency decreases. Note: 1. Above parameters are measured at 5V, may be different in other voltage. 2. This product is not a sophisticated circuit, not suitable for high precision. Colour:Green Material:PCB<br><br>Package Contents: 1 x Square Wave Adjustable signal generator Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.