Waveshare 24921 Modbus RTU 16-Ch Relay Module, RS485 Interface, With Multiple Isolation Protection Circuits, 24921 For iPhone X If you are looking for

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one-handed operation

Power: 4xAA batteries(not included)

One Package Size 11cm * 9cm * 6cm / 4

40HQ: 2360 cartons * 84 pcs = 198240 pcs

Waveshare 24921 Modbus RTU 16-Ch Relay Module, RS485 Interface, With Multiple Isolation Protection Circuits, 24921 For iPhone X If you are looking forFeatures: 1. This product is an industrial grade 16 channel relay module controlled by RS485 bus, using Modbus RTU protocol, built in power isolation, ADI magnetic isolation, resettable fuse, TVS diode and other protection circuits, and equipped with ABS case. 2. Modbus RTU 16 channel relay is very easy to use. Due to its fast communication speed, stability, reliability and security, it is ideal for industrial control equipment and or applications