1 Way Relay Module 2 Working Modes ESP‑01 WiFi Relays Modules for Smart Home Phone Item Type: 1 Way Relay Module Main Parameters: 1. On board high performance microprocessor and ESP-01WIFI module. 2. The Module has 2 working modes: ① The mobile phone is directly mounted on the WIFI module. ② The mobile phone and WIFI module are installed on the router at the same time. (Additional Function: Can be used as a USB relay when ESP-01 is unplugged) 3. Transmission Distance: ① In an open environment, the maximum stable transmission distance is 100m when the mobile phone is mounted on the WIFI module. ② When the WIFI module and mobile phone are mounted on the router at the same time, the transmission distance depends on the signal strength of the router. 4. Use Smartconfig technology to configure the account and password of the ESP-01WIFI module on the mobile APP. The configured account and password have the power off memory function. 5. The on board 10A/250V AC, 10A/30V DC relays can be activated continuously for 100,000 times, have diode effusion protection, and have a short response time. 6. On board mode selection and real time working status indicator. 7. Reserve UART debugging interface and MCU program download interface.