Features: brand new and high quality Widely used. Stable performance. The operation is simple and easy to understand. According to requirements, there are two options available. LILYGO T-Relay is equipped with 8 Channel Relay (With Optocoupler Support) and ESP32 (Supports WIFI Bluetooth-compatible), and each relay is equipped with an individual indicator and a red custom indicator. Package Includes: 1 x Welded plate 1 x Welding plate with downloader Specifications: MCU: ESP32-WROVER-E FLASH: 4MB PS RAM: 8MB Communication protocol: UART, SPI, I2C, CAN, I2S, SDIO Wireless Protocol: Wi-Fi: 802.11b/g/n Bluetooth: V4.2BR/EDR and BLE On-board functions: 8 relays, optocoupler isolation, 16 expansion 1O HRS4H-S-DC5V relay: Maximum switching voltage: AC 250v, for DC 28v K1--1033K2-1032K3-1013K4-1012 K5--1021K6-1019K7-1018K8-1005 Maximum response/release time: 8ms/5ms Maximum switching current: 15A External power supply voltage input range: DC12~24V Working temperature: -40~80C Support T-U2T downloader: Eight blue LEDs T-U2T LILYGO Relay working indicator Can be connected to use T-U2TUSB to serial downloader It can also be directly powered by Type-C USB note: Please allow 0-1cm error due to manual measurement. plz make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you