Wi-Fi Operated. Connect Shelly EM to your Wi-Fi network. No HUB required! Power Monitoring. Shelly 3EM monitors monophase electrical systems with up to 3 points simultaneously. Smart schedules. Set custom schedules based on a daily agenda or working hours. 365 days of data storage. The measurements from Shelly 3EM are stored in a free cloud for 365 days. Contactor control. Shelly 3EM has an integrated 10A relay output for contactor control. Smart scenes. Set custom scenes by combining Shelly 3EM with your other Shelly devices.