<p>1. This module complies with safety standards, and there is an isolation slot between the control area and the load area.</p> <p>2. It uses high-quality relays, with power supply and relay action indication, bright when closed, and not bright when disconnected.</p> <p>3. When there is a signal at the signal input end, the common end and the normally open end be connected.</p> <p>4. It can be used as a single-chip microcomputer development board or PLC module, and can be used for home appliance control.</p> <p>5. It can control DC or AC signals and can control 220V AC loads. It is more convenient to connect the blue KF301 terminal to the control line.</p> <p>Item Type:1-way Relay Module</p> <p>Power Indicator:Green</p> <p>Wiring principle:High level trigger refers to the trigger mode when there is voltage between the signal input terminal and the ground, which can be understood as a trigger mode when the signal input terminal and the positive pole of VCC are short-circuited. Low level trigger refers to the trigger mode when the voltage between the signal input terminal and the ground is 0V, which can be understood as a trigger mode when the signal input terminal and the negative pole of GND are short-circuited.</p> <p>Due to different batches,there may be differences in product appearance and printed text, which not affect use</p> <p>Colour:Blue</p> <p>Material:plastic</p> <p>Specification:5V</p> <p>Package Contents:</p> <p>1 x 1-way Relay Module</p> <p>Only the above package content, other products are not included.</p> <p>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.</p>