Metering Devices -Relay Board Module Highlights Generic Brand Relay Board Module Description: The control area of the module has a separation slot from the charging area Using circuit board design FR- 4 double-sided, high-end chip production process With power supply and relay action instructions, pull the light, disconnection is not bright When the signal input has a low level signal, common terminal and normally open terminal are activated The relay can directly control different devices and loads There are normally open and normally closed contact KF301 blue terminal access control line is more convenient Package includes: 1 piece relay module Note: The power should be DC, the voltage should be according to the voltage of the relay. Due to the measurement difference, pls allow 1-3mm error.