1: Wide range of applications 2: Onboard mature and stable ESP32-WROOM-32E module, -capacity 4M Flash 3: The I/O ports and UART program download ports of the ESP32 module are all led out to facilitate secondary development 4: supply voltage AC220V/DC5-30V 5: Onboard ESP32 module IO0 programmable button and reset button Board size: 93 x 87mm Weight: 92g Usage: General Purpose : Time Relay Voltage: 220V Number: ESP32-WROOM development board Feature: Sealed Source: DC Contact Load: Low name: esp32 relay feature: wifi relay color:As shown Material:PC+Metal Package Contents: 1 x AC/DC supply ESP32 four-way relay module 2 x 10 double row PIN 1 x 6 single row PIN4 1 x Single line cap Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.