1 Channel Relay Shield Module, 10PCS DC 5V Indicator Light LED Module for Arduino R3 MEGA 2560 1280 ARM PIC AVR STM32 Raspberry Pi MCU DSP Official Boards Shield (10PCS): Amazon.com: Industrial
24v 1 CH Channel Time Delay Relay Control Module Digital Led Display Timer Module Switch Relais Cycle Timer Controller Board: Amazon.com: Industrial & Scientific