The Shelly Pro 4PM Wi-Fi & Bluetooth Relay Module is a 1-phase, 4-channel dry contact relay module that mounts inside your breaker box to add Wi-Fi, LAN, & Bluetooth remote control and energy monitoring for up to four electrical loads in your home or business. The Pro 4PM supports up to 40A for a single load or up to 16A from all four connected loads. Three press buttons on the front plate enable users to scroll and navigate the device's menus with press and press and hold inputs. The LCD screen has a short status info bar at the top that displays the live status of inputs and outputs with color coded indicators. Use the Shelly Smart Control app to help you control your connected devices remotely and receive alerts directly from your smart device. A Shelly Smart Control App user account is required to access, include, and control Shelly devices through the Shelly Smart Control app and include your Shelly devices to 3rd party home automation or voice assistant platforms.