Hosyond 4Pack 4 Channel DC 5V Relay Module with Optocoupler Relay Board for Arduino Raspberry Pi MEGA2560 industrial Two-pack of two-way pumps /

Two-pack of two-way pumps / air inflators for quick and easy inflation of a wide variety of inflatables

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Hosyond 4Pack 4 Channel DC 5V Relay Module with Optocoupler Relay Board for Arduino Raspberry Pi MEGA2560 industrial Two-pack of two-way pumps /Hosyond 4Pack 4 Channel DC 5V Relay Module with Optocoupler Relay Board for Arduino Raspberry Pi MEGA2560 Module parameters: Size: 71. 5mm(L)52. 7mm(W)18. 5(H)mm Single weight: 56g PCB color: blue There are 4 fixing screw holes around the board, the hole diameter is 3. 1mm, which is convenient for installation and fixing High quality relays. A common end, a normally open end, and a normally closed end. Optocoupler isolation, good anti interference.