Feature: 1. [8 CHANNEL DESIGN] The relay module is 8 channel design, with less interference and a wide range of applications. 2. [EASY TO CONTROL] Can control multiple channels with a single command, can control multiple devices, easy to use. 3. [WITH LED INDICATOR] Both the power supply and the relay have LED indicators, and the working status is clear at a glance. 4. [COMPACT SIZE] The relay switch module is small and compact, easy to install and does not take up space. 5. [WIDE APPLICATIONS] Widely used in remote control systems, smart homes, identification systems, data collection, etc. Specification: Item Type: Relay Module Product Material: PCB Product Model: N223B08 Working Voltage: DC 12V Communication Protocol: UART Standby Current: 17mA (all relays closed) Indicator Light: LED Applicable Scenarios: Remote control, telemetry system, wireless instrument, smart home, home automation, smart home, access control, identification system, data collection, IT home appliances, smart home appliances, baby monitoring systems, etc.. Package List: 1 x Relay Module Note: Please use the correct working voltage.