The 5PCS/LOT 4 Channel 5V DC Relay Module Solid State low level SSR AVR DSP is a four channel solid state relay module intended for 5V DC control signals. Each of the four channels provides isolated, silent switching for loads through a solid state relay, offering reliable performance in microcontroller based projects. Key benefits Low level trigger compatibility: designed to be driven by 5V logic from microcontrollers such as AVR and DSP, enabling straightforward integration with common development boards. Solid state reliability: no mechanical contacts, resulting in silent operation, reduced wear, and longer life compared to traditional mechanical relays. Four independent channels: one compact module provides four separate switching paths for multiple loads. Control/load isolation: ensures separation between the controller side and the load side for improved electrical safety. Straightforward integration: compatible with 5V logic systems and easy to wire into existing circuits without complex circuitry. Key attributes Channel count: 4 channel solid state relay module Input voltage: 5V DC control signals Trigger type: low level trigger designed for active low input from microcontrollers Technology: solid state relay (SSR) for silent switching Applications: suitable for AVR DSP based projects requiring reliable, isolated switching of external loads Packaging: 5 pieces per lot (5PCS/LOT) Applications and use cases Microcontroller projects: control lamps, fans, or other loads from AVR or DSP controllers using a low level trigger input. Home automation and automation testing: integrate four independent load channels with a single 5V control source for testing and automation tasks. Prototyping and labs: use in development rigs to switch multiple devices safely and quietly without mechanical wear. Notes This description reflects the product's specification of 5PCS/LOT, 4 Channel, 5V DC Relay Module, Solid State, low level SSR, and compatibility with AVR DSP environments. The module provides solid state switching suitable for applications requiring isolated control with 5V logic inputs. Safety and proper wiring practices should be followed when connecting to external loads.