1. ESP8285 Dual-Channel Relay Development Board, 220V Two-Channel Modification Parts, Secondary Development Wifi Development Board 2. Press S2, The Upper Relay Will Activate. Press Once To Close The Relay, Then Press Once To Disconnect. When Pressed, The Green Light Will Flash Twice. 3. Press S1, The Lower Relay Will Act. Press Once To Close The Relay, And Then Press It Again To Disconnect. When Pressed, The Green Light Will Flash Twice. 4. The Shell Is Made Of Environmentally Friendly Abs Fire-Retardant Material, Which Is Stable, Durable, Safe And Safe To Use. 5. Without Voltage Output AC 90V-250V (Controlling A Dc Motor) Product Name:ESP8285 Dual-Channel Relay Development Board Power Supply Mode:Zero Live Wire Power Supply Input Voltage:AC 90V-250V Controllable Lines:Dual Circuit Support Maximum Current:10A Note:Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use Colour: Material:ABS Size:About 120x38.8mm Package Contents: 1 * Wifi Development Board Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.